Contour Enthusiasts Group Archives Forums Modifications General Mods oil pressure gauge and amp gauge

That would be great for a voltmeter, but an ammeter needs to be wired in series. According to the instructions of the last one I did, they wanted it in series between the alt. and the battery. If it is a voltmeter, you want it on a switched source. Otherwise the gauge will be reading and drawing power when the car is off.