I have two tire gauge and i'm not really sure which one is accurate because they are not calibrated.. they are not reading the same it's plus and minus 1.5 psi
I would say +-1.5 psi is very little for tire pressure. If the gauges are from different brands, my guess is both are fairly accurate. May head to a local garage and ask them to measure the pressure with their gauge, then compare with yours.
