Temperature gauge has stopped working. trying to trace where it is connected under the hood. Is the gauge connected to a sensor with the single wire at the thermostat (the one which just pulls off) or is it connected via the larger multi-clip bundle below the thermostat? If I locate the correct wire, is there a way I put a charge on it to see if the temperature gauge moves so that I would know if I had a bad gauge or a bad sensor? Thank you.