TPMS how accurate?
Fleet Mechanic
Joined: Jan 2015
Posts: 1,377
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From: SE Michigan
The newer (2008?) direct pressure sensors are usually pretty accurate (1-2 psi). That said, I would only use TPMS to warn you of a puncture or an active air leak. You should check your tire pressures at least once a month or so with a gauge you know is accurate.
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Logistics Pro
Joined: Jan 2013
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Then check with a dial or digital guage, if its off, air up/down to get what you want (IF you trust YOUR dial more than the TPMS).
Either way you trust make a notes on each wheel:
Dial reads 60 psi
TPMS reads 64 psi
You wanted 64 but you have put your TRUST in the dial, so you ADD 4 lbs to read 68 and now your dial reads 64
OR
You can trust the TPMS like I do and I have run the numbers several times and its +/- 1 lb every time...your mileage and psi may be different.
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