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rojo's avatar

Should I trust the tire pressure sensor in my truck or a hand held gauge?

Asked by rojo (23660points) November 22nd, 2017

My tires looked a little low. The truck gauge read clockwise from driver front: 33, 34, 33, 32 psi. I checked it with a hand held tire gauge and got 29, 30, 29, 29. I borrowed my neighbors and got the same readings: 29, 30, 29, 29. So I filled all the tires up to 35 psi according to the hand held gauge. The truck automatic gauge read 39, 39, 39 38. So it appears that it is 4 psi different from two separate hand held gauges (one a stick, one a dial).
Which should I believe? The one built into the truck or my old gauge that I have used for years?
Any thoughts?

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7 Answers

JLeslie's avatar

Maybe you need a gauge to break the tie? For now I’d fill my tires in-between the two.

Tropical_Willie's avatar

Were all three used without moving or driving the truck?
Driving the truck will increase the pressure.

elbanditoroso's avatar

Gauge. The tire mounted ones are subject to all sorts of external issues. Not really to be trusted.

rojo's avatar

@Tropical_Willie no movement and all measurements within a few minutes of each other.

Call_Me_Jay's avatar

Segal’s law – A person with a watch knows what time it is. A person with two watches is never sure.

I had a digital tire gauge and a pencil gauge and fretted over their disagreement. When the digital’s batteries died, I threw it away and it relieved me of the mental burden.

Zaku's avatar

Hand-held gauges win, especially if they agree with one another.

snowberry's avatar

You might want to take the truck into a tire shop and check their readings.

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