The red light comes on when the key is turned on only, but does not stay on, The gauge will not work, WHY???, Is it the sensor on top of the resv. or does it have a sensor some where else???? He does have my car right now, the 88 Fox, Walter D. Leonard III 1999 VW Passat S/W Colorado Red 1.8 5-speed 1988 VW Fox S/W Alpine White 1.8 4-speed 1987 VW Scirocco 16V Alpine White 5-speed 1981 Kawasaki GPZ 550