[ebds2019]

Hi folks. I have a tst tpms 507 system. I use flow-thru sensors on my 6 dually tires and my 4 Montana tires.

In the past the unit has seemed pretty accurate. Lately it’s pretty far off. I first use a compressor with an inflation valve with gauge to top of the tires. Then I use a digital gauge to check them in case the inflation gauge is off.

Then I turn on the tpms and all the tires show 5-8 psi lower, which starts to trigger low pressure alarms. My alarms are set at 20% higher for high pressure alarm, and 10% lower for low pressure alarm.

I don’t know why the readings are off. Since two prior gauges are consistent (inflation gauge and digital gauge) I am guessing it’s the tpms that is off.

Any help here? I’m pretty confused about this anomaly.