Does anybody know how the GM temp sensor/gauge works. My thinking is that power goes in the guage. That power comes out the other end and it grounds out through the sensor. The hotter the senser gets the more current it lets through. I have two gauges that if I hook up to the batter on the + side and run a wire from the - side to the sensor I do not get that result. I can't find any test methods or normal ohms reading for this two items. If i ground out the sensor the gauges peg.