Tire Pressure Monitor System for the F 450 and F 550. Monitors pressure and temperature of the tires. Mobile head unit is solar powered, has a night light and fits any-all of our conversions. Screw on battery pressure and temp sensor has a 5 year life and has a rubber cover for protection. You can also add 6 more sensors for a trailer or duallies. $105 plus shipping. We have sold a lot of them and highly recommend these for our conversions.