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Decent.
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Prices may varyThis product ranks #3 of 7 in Tire Pressure Monitor (TPMS).
Last reviewed June 14, 2026
TL;DR Manufacturer-rated at ±1 PSI but no independent reference-gauge cross-check was found at time of review. No community follow-up data on long-term sensor battery life was found at time of review.
The TST 507-RV-4-C is an external-cap TPMS kit built for RVs and towing. Four CR2032 cap sensors transmit pressure and temperature at 433.92 MHz via an included repeater to a 3.5-inch color display that monitors up to 115 tires across four trailers. FCC ID TAD7104 is on the sensor label but could not be confirmed in the fcc.gov database at time of review. Sensors cover 1·218 PSI and −40°F. Three-year warranty included.
Good fit for RV owners and towers who need long-vehicle RF coverage and trailer mode. Passenger-car drivers can find capable TPMS options at lower price points.
FCC ID TAD7104 is claimed but not independently verifiable via fcc.gov or fccid.io at time of review. The display charges via 12V car adapter · no AC wall plug included. No active CPSC recall found for the 507 Series. Dispose of the display Li-ion battery and CR2032 sensor cells via Call2Recycle.
The cap sensors use CR2032 batteries, which are user-replaceable in the driveway · no tire shop needed. The manufacturer estimates 1 to 1.5 years of battery life per sensor under normal use.
Yes · the kit includes a signal repeater specifically for long-vehicle applications. The display supports trailer mode and can monitor up to 115 tires across the towing vehicle and up to four trailers.
Yes · the 507 cap sensors are compatible with both metal and rubber valve stems. No modification to the valve stem is required.
The cap sensors support 1 to 218 PSI, which covers RV, trailer, and light truck applications where tire pressures can run significantly higher than a passenger car.
Marketing copy from TST (Truck System Technologies), via Amazon. Not editorial.
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