There is a lower limit on the sensor. I forget the number (somewhere between 25-30psi), but i do believe it does not go low enough for <20psi to be the standard running pressure.@dubyahard - I wouldn’t have the tire touching the panhard as that needs to move as your suspension cycles.
@grinchy I’m not sure if there is a lower limit on the TPMS but if you reset the TPMS by holding the button under the dash it should reset the default pressures to whatever your tires currently are and then only light up when your pressure drops 20 or 25% below that (I can’t recall which).