My TPMS system is about 2 psi different than my digital pressure gauge.
But what is important all of my TPMS sensors read the same and what is even more important that I get the same readings from all tires while under way.
If any TPMS pressure has dropped more than a couple psi I pull over when convenient to investigate.
I have only had to pull over once and I found a 3/8 by 2 inch bolt in a trailer tire.
I was able to catch this before the TPMS alarmed as I watch my pressures often when under way. The pressure had not dropped to the alarm point when I noticed the tire was about 3 psi lower than the others.
