The spare tire doesnt give a reading on the dash. If it gets low you'll get a "check spare tire" message on the display.

I also like the TPMS system but Chrysler screwed up when they superseded the metal stemmed sensors with the new rubber stemmed version..... the new part numbers dont work with my system so im waiting for a TSB to come out with a fix. Yeah, technically its a "safety" issue so I could force Chrysler to get more involved but I dont have the time nor the patience.