I have the TST flow through system and really like it. They have awesome support as well. I had an issue with 2 sensors not actually working to air up with the flow through. And one was showing an incorrect psi. I called TST and we did a test over the phone on another vehicle and they worked fine. Turns out the issue is the valve extenders. Apparently some extenders (and I've had issues with those before) don't relay the pressure correctly to the sensor. Not to mention it's a longer reach for the temp as well. So it turns out the sensors are fine but they don't always play well with the extenders. Have to see if I can mount them directly and get rid of the extenders. I wouldn't have an RV without a TPMS.
