The low pressure light came on in my car this morning so I grabbed the tire gauge in the glovebox and checked one. Imagine my surprise when it rocketed up to almost 50 psi. The tire was no more than 35 psi even before the light came on, so that gauge is worthless. That’s the worst example, but every tire gauge I have reads different. I finally decided to standardize on a US made one I bought from Amazon, but I still have no idea if it’s accurate.
How does someone find out what the true pressure reading is on a tire, or to calibrate a gauge?
How does someone find out what the true pressure reading is on a tire, or to calibrate a gauge?