Heh. I don't use a hand held gauge on the tires of my Rubicon. My former one had reasonably accurate reads from the TPMS too. When I first started driving a vehicle, that "former one", I did check the TPMS against the gauge. I have a good gauge that I keep for airing down and back up, and that is a good check if the TPMS says one of the tires is low. I also have chalk and can drive around the block after chalking a patch on each tire. That works better than any gauge IMHO.