My front drivers side alarm went off for high pressure. It's not, Is this probably a battery issue in the sensor itself on the valve stem?
I've had that happen too and never found out why. Stopped the coach used manual gauge, all was well. Put the sender back on and it read correctly and still does.
What are you using for a TPMS? What did the monitor say the pressure was and what was the pressure you saw with a gauge? A battery issue will generally cause the sensor to not send data rather than send false data.
Mine does the same . In order to set the running parameters, you have to get into setup mode and re zero the sensors. i think that my cheapass system allows 12# of build from initial setup .