I've been using Teflon tape on the valve stem thread as an added seal with my old 510 sensors. Also helped prevent the sensor from loosening from vibration. Just replaced the 510 with a 507 system. Will try them without tape and without repeater.
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Dave and Ivy
2020 North Point 315RLTS
Ram 3500/Aisin CC, SB, SRW, Superglide
Firestone Ride-Rite Air bags, TST507 TPMS
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