[AL in NY]

tuneman: I purchased an after-market TPMS that plugs into a cigarette lighter. I chose one that a knew worked on 6 volts. Because I am using 35 Ford 16 inch wire wheels, the included valve stems are too small in diameter to fix the 16" wheels. I had to modify the larger metal valve stems to take the mounting ball from the TPMS valve stems. The pressure is sensed with a wireless connection between the tire sensor and the receiver. The TPMS system I purchased also tells me the generator output voltage.