TST 507 Tire Pressure Monitoring System with 2 Cap Sensors and Color Display for Metal/Rubber Valve Stems by Truck System Technologies, TPMS for RVs, Campers and Trailers…

Easy to install if you follow the instructions.

The internal and external parts seem to work as outlined by the instructions. I purchased this unit for a 2003 Class C motor home 24 foot with rear dully wheels. I used metal valve stems on all 6 wheels and had to cut the rear dully wheel covers valve stem opening (used Dremel cutting wheel) to allow more room for caps to be taken on and off. I do find the initial connection (turning the display unit on after being off) between the internal display unit and some of the wheel some sensors take about 5 min 6 min to connect. This occurs even with the front tires which are closer to the display (I have held the display unit at various distances and still see a delay). The display is not a touch screen (seems a bit out dated considering the price point). Paring the cap sensors to the display was easy for some sensors and hard for others. As best I can tell the accuracy for pressure reading compared to a tire gage (non-digital) seems to be within a 1- 1.5 lbs. I did not use the repeater that comes with the unit as it is not having any effect due to the short distance between the display and wheels of my motor home. I have not cut the front wheel covers at this point I may in the future to allow for taking on and off the caps. I would recommend the unit.

Difficult to read in some sun conditions but just move it somewhere else and it is fine. Color monitor is useful. Alarm when limits exceeded will definitely get your attention. Havent tried to remove the caps yet, so not sure how easy or how much air will escape when I do yet. Otherwise seems perfect. Works without repeater for 36.5 foot Class A RV. Very happy with this purchase.

TST has 2 types of sensors for the Series 507 system. Both have the same part number (TST-507-RV-S2). Both types work with the Series 507 display but they are NOT the same. One is the anti-theft twist cap type (pictured below). The other is the lock-nut type. The two types use entirely different wrenches. Neither wrench will work on the other type. They also use different size batteries that are not interchangeable. I ordered the TST 507 Tire Pressure Monitor w/8 Cap Sensors. However, TST does not package the 507 monitor with 8 sensors. (???!) Tweetys shipped the TST 507 Tire Pressure Monitor w/6 Cap Sensors plus a 2-pack. The monitor came with 6 twist-cap type sensors. The 2-pack was the lock-nut type. Given the two types have the same part number I understand why Tweetys did that. However, I did not want to have to carry two types of wrenches and two types of batteries. If you order the monitor with 8 sensors, make sure you get all the same type of sensors. I contacted TST. They said the two types with the same part number is a rolling upgrade. Yeah, thanks!

Like the support, ease of install, the accuracy. IMHO the best system available to the RVer.

The directions where clear and the programming of each wheel was easy. Unit reads wheel information like advertised.

The set up is a bit tricky first. But after setting up six sending units I got the hang of it pretty well. seems this TPMS System works very well. I do not wish to travel without one.

got this set of 4 for our fifth wheel. easy to set up, did not need the extension kit and it is very accurate. on a trip the left side was 10 degrees higher than the right, then realized that was the side of full sun.

It works well, and means I dont worry about my tires while Im driving. Only con is that the display is so dim it is very hard to read, especially on a bright day. I called customer service for help making it more readable, and was told that the brightness of the screen is NOT adjustable. They suggested I move it to the bottom of the windshield, which I did, but it is still very dim. I can only hope that any alerts it announces will be easy to see!

Pairing cap sensors is a bit time consuming.