All ActivityMost RecentMost LikesSolutionsRe: TST 507 REPEATER REGUIREMENTI have had a TST tire pressure monitoring system on my coach for about seven years. We have been full time for eight years. I have had the 510 cap system and then changed over to the 507 cap and flow through system. I like the convenience of the flow through system to be able to air up the RV tires with the sensor still on the valve stem. I use the 507 cap system on the car because the sensor is smaller in length and, with my Saturn, the cap sensor does not stick out as far. I have a 40' coach and the Saturn tow vehicle. I used the original 510 system without a repeater for a time and had a sensor drop out once in a while. Tech Support at TST told me to add a repeater and that did the trick. No more sensor dropout and a reliable signal. For $49.95 for the repeater, it was not a financial crisis to add it and try it! If you are having problems with the system, first call TST for technical support at 770-889-9102 and do what they suggest. They deal with the nuances of the TPMS systems day in and day out and will be of great help. Don't complain about an issue if you did not contact them first. I am sure they will make it right. They have always done so with me. On another note, I got a high temperature warning from my towed vehicle front tires and pulled over. I found the Roadmaster air brake in the car was adjusted too tight and the brakes were rubbing, thus causing the wheel to overheat. The system saved my bearings, tires and probably some other car parts too. So the fact their system also shows temperature is very important. I am a happy long-time Truck System Technologies customer.