I went out and bought a digital gauge at Auto Zone to double check. It's a "Slime" brand as well as the analog gauge that I already had is a "Slime." The digital gauge reads right on (within a pound on each tire) with the analog gauge, so I'm assuming that the TPMS is reading low. Digital gauge is showing 99 and 100lbs as well as the analog. The TPMS monitor is showing anywhere from 95-99lbs and the temperature is still reading ambient temps since I haven't moved the coach yet. We're heading out for the weekend in a little while, so I'll get a test of the TPMS' relative indication of temp and pressure increases.