Tag Archives: safety

The GUTA RV Tire Pressure Monitoring System Is Great For Vehicles That Lack Real Time Monitoring

We had a 2,200 mile trip planned expensive things are with a 2016 Ford Transit 150 that had six year-old tires on it – yeah, they need to be replaced but money is tight with inflation thanks to the politicians. The tread was definitely above the wear bars but the outer layer of rubber was starting to crack. So, I really wanted something to let me know how the tires were doing during the trip.

One thing I really like with my 2021 Ram 2500 is that I can see the tire pressure in real time. Our 2016 Transit has a basic tire pressure monitoring system (TPMS) but doesn’t report to you what the pressure is – it has has an indicator light if something goes wrong. I really wanted something real time for the van and had seen aftermarket TPMS units that had a receiver and sensors that went on the tire valve stems in place of the caps before.

I started doing some research and while there were a lot of different cheaper models out there, I went with the M20-4 (meaning 4 sensors included) model from GUTA on Amazon based on reviews. I’m actually writing this 1,100 miles into our trip and am quite happy with the unit so let me tell you more about it.

Out of the Box

Literally, the unit comes ready to go other than needing a quick topping off of the main receiver’s battery using a Micro USB cord. The sensors have their batteries loaded and are already programmed to the unit.

What you see on the box was included along with 4 sensors and 4 spare O-rings. I didn’t use their adhesive pad and just opted for a couple small pieces of velcro.

The unit recharges its batteries via the solar panel or you can plug it in – the provide both a car/truck cigarette lighter to USB adapter as well as a short cord, I planned to just run via solar so I didn’t bother.

I bought the four sensor model and in the box there are four ready to go sensors with their batteries installed already programmed to the receiver. The are labeled LF (Left Front), LR (Left Rear), RF (Right Front) and RR (Right Rear). Left and right are from the driver’s perspective looking forward.

All of the sensors were labelled, had the 2032 battery already installed and were programmed to the M20 receiver.

One of the reasons I bought the GUTA M20-4 was that nobody reported needing any extra antennas to pick up the data from the TPMS sensors. Our Transit is a full size 150 model so the wheelbase is about 148″ so I wanted to make sure I wouldn’t have a problem.

In terms of the sensors, they just go on the valve stem in place of the valve cap. Be sure to put the right sensor, such as the LF- Left Front – sensor on the right tire of course.

To install them you put the jam nut on first and thread it to the bottom. Then screw on the sensor until it stops – you will hear air leak for a second until the sensor seals as you continue threading it on. You then use their special wrench to snug down the jam nuts to lock the sensor in place. Done.

Here you can see the brass jam nut. By snugging this up against the back of the sensor you are pretty much locking the sensor in place due to the tension it creates. Note the elevated black plastic on the sensor under the jam nut – this is where you use the other end of the wrench to open the sensor to replace the battery when it dies.
This odd looking wrench serves two purposes – the left end us for unscrewing the battery cap on a sensor unit. The right end is offset to make reaching behind the sensor to tighten or loosen the jam nut easier. The offset allows the wrench to clear the sensor body and appropriate engage the jam nut. I put this wrench and the spare O-rings to seal the battery compartment in a clear plastic storage bag and put them in the van for future use.
Rather than use their supplied mounting material, I used some industrial Velcro. You stick it on to a clean surface and let it cure for 24 hours. It does a great job after that. The reason I did this was I wanted to be able to move the unit around some without the Velcro showing.
To give you a sense of scale, you can see the van’t instrument console and my hand – I wear an XL-sized glove. The receiver is small but I find the numbers of the display very easy to read from a normal driving position.
The top back of the unit has the solar cells and I have found they do the job. I let them charge during the day and just let the unit run. I don’t turn it off. By the way, there’s a little sun icon that means it is charging and there is also a battery charge indicator in the display as well.

The Device’s Configuration Screens

Well, the mechanical installation was very easy. The set up screen took a few minutes to figure out but wasn’t too bad. The set up screen lets you select pounds per square inch (PSI) or Bar, whether you want Farenheit or Celsius and then the Low and High pressure literally for each tire. An alarm will sound if either the low or high pressue is exceeded – I’ve experienced that. There’s also a high temperature tire warning that applies to all tires.

For the van, I set the low pressures all to 65 PSI and I set the max to 100. The tire temperature was set to 158F by default and I left it at that figuring I would see what happens and adjust accordingly – I had no idea what to expect actually. I did do some reading and somewhere between 190-225F is the maximum safe temperature for a tire to reach – it depends on your tire’s temperature rating.

The unit supports two modes – Mode 1 is for normal street driving and Mode 2 is for offroad or something. I had no need to explore this as our van isn’t going to go offroad.

By the way, you can add sensors or reprogram/pair sensors if need be and the instruction manual tell you how. They sell versions of this system with more and more tires supported and different displays let you see the status. Again, I just bought the model for four tires. I could add sensors to support a trailer though even with the model I have.

The Results

Honestly, I am very happy. It’s been intriguing to see how temperature affects tire pressure – that one I expected. In general, as temperature increases, the volume of a gas increases so this means that the pressure would increase in the tire.

What I didn’t really expect was to see that with driving, the back tires were a tad warmer than the front and also had about 2 PSI more pressure than the front. Tire temperatures where about 10-15 degrees warmer than the outside tire temperature when driving. It’s 95F here and when we were parked on asphalt the heat of the day would take the tires up to about 101-104F and then they would cool down as we drove.

The pressure is real time but the temperature cycles from tire to tire every 5 seconds, Note the pressure when the temperature was 61F. So you can’t tell which tire was sending the temperature in the photo but in real like, the little tire part of the graphic would be flashing so you’d know what it’s temperature is.
Here are the pressures at 77F – again, one tire was at 77F and I bet the others would have been very close to that.
This one is close to 91F. Note, all of these photos are with the same tire pressures. I filled the tires, installed the sensors and have just watched the numbers change. We had ten hour days with me driving so it gave me something to do in addition to staring outside, self-mediation and pondering existience 🙂

I think the manual said the 2032 batteries in the sensors would last about 6 months. I guess we’ll just have to see about that. Cold Michigan Winter weather takes its toll on batteries because as the temperature drops so does the chemical reaction in the batteries and thus less voltage is produced. I’m really not worried because I did open a sensor and it is real easy to replace the batteries.

To sum it up – The installation was very easy and I like being able to see the pressures at a glance. Knowing that there would be an alarm if a threshold is passed or the pressure starts dropping rapidly too are all reassuring.

So, I like the system and would buy it again.

Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.

If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at info@roninsgrips.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

Add A Glass Blind Spot Mirror To Your Car Or Truck For Safer Driving

Have you ever noticed that when you look in your side rear view mirrors of your car or truck that there is a “blind spot” that vehicles can disappear into? I can’t tell you how many times I’ve had a surprised motorist beep their horn because I didn’t see them when changing lanes or turning. There is definitely a way to fix that with what are known as “blind spot mirrors”.

Blind spot mirrors have been around for many years and basically are a 2″ convex (meaning bugled outward) mirror that sticks onto your OEM side view mirror with a piece of double sided tape. They worked but many had a weakness – because they were made from cheap plastic, the mirror finish sound start to fade/oxidize over time and instead of a perfect little mirror, you had black spots obscuring your view and defeating the whole reason you bought the little things.

A few years ago I ran across a vendor on Amazon of glass (not plastic) blind spot mirrors known as “Ampper”. These glass mirrors don’t break down like the plastic ones — at least they haven’t yet on our vehicles. I bought our first set in June of 2019 and have slowly replaced the plastic old plastic blindspot mirrors as they failed. In the case of my new 2021 Dodge Ram 2500, I bought the mirrors and installed them right after I got the truck.

Note, they come with some little plastic swivel mounts that you can optionally use. I find them too light for my liking and instead just clean the vehicle’s mirror and stick the blind spot mirror directly on the OEM mirror.

The Ampper mirrors come in two packs – two mirrors and two swivels mounts – enough to do one vehicle. Note, I don’t use the swivels. Click here for the Amazon listing.

Even though my new 2500 has giant mirrors, I felt like I was more likely to catch a vehicle by the side of my truck by adding the blind spot mirror.

You can see the blind spot mirror provides a different perspective of what is going on next to the truck. I have them on both the driver and passenger.


I’d honestly recommend these for any car or truck to help reduce or eliminate the blind spot but ultimately you need to figure out how best to make sure there aren’t obstacles/vehicles in your way. You can get them off Amazon [click here] and they are cheap insurance.

I hope you find this helpful.

Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.

If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at info@roninsgrips.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

Assembling an AR Lower – Step 7 of 11: Installing the Selector Assembly

The selector assembly is what allows a regular AR to either be on “Safe” by blocking the trigger’s movement or “Fire” my allowing the trigger to pass.  It’s actually a very straight forward design and I like those.  Now I like ambidextrous selectors and they are just like a normal one but have a small lever that is screwed on to the operating side after the selector is installed.  This is a Palmetto State Armory (PSA) model that works just fine for me.  Note, some guys like these and some don’t because you will feel it on the other side, which some guys find to be weird and not to their taste.  Bottom line, use what you like.  If you’ve never felt one before, try and hold an AR with and ambidextrous selector before you buy one.

To install it, first cock the hammer and insert it from left to right with the selector pointing in the “Fire” direction.  You may need to wiggle the trigger some to let the selector pass.  If you are using a Mil-Spec selector, you are done other than function testing.  If you have an ambidextrous selector, most have a groove on the other side and you simply mate up the right side lever.  Before install the small screw that holds in it place, put a bit of blue medium-strength Loc-tite on the screw so it is held in place.  If you do not apply some form of thread locker, the screw will loosen and fall out.

To function test the fire control group (FCG) overall, you need to do the following but remember to NOT let the steel hammer slam into the aluminum magazine well – control the hammer’s movement with your thumb, fingers or whatever (meaning hold it – don’t put your fingers in front of the hammer and hit them – that hurts!!).  Each test below assumes that you can accomplish the step – if not, something is wrong:

  1. Cock the hammer back and the trigger should grab it.
  2. With the selector on FIRE, pull the trigger while holding the hammer with your thumb to control its movement – the trigger should release the hammer.
  3. With the selector on SAFE, pull the trigger and the trigger should not be able to move.  If the hammer is released then something is very wrong.
  4. Now, put the selector to FIRE, pull the trigger back and while holding the trigger back, cock the hammer – the disconnector should grab the hammer and when you release the trigger, the hammer should move from the disconnector to the trigger body.  Now, pull the trigger and it should fire like normal.

Now, a word of caution – if you do not feel comfortable with any of this, please see a gunsmith.  If you have any doubts at all, please see a gunsmith.  I want you to enjoy assembling your AR but I want you to be safe even more.

That’s it for this step.  Next up is installing the pistol grip, which also includes installing the detent and spring that hold the selector in place because the pistol grip holds them in position.


If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at info@roninsgrips.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

AR Parts Sources

There are a lot of reputable AR parts vendors online but beware of eBay and bargain basement dealers that sell airsoft parts and tell you they will stand up to firearm use – they will not. At any rate, here are my top sources of AR parts: