I have a 95 PSD and the water temperature gauge doesn't work. I tested the gauge by grounding the sending wire and the gauge shot up to hot. the gauge does work. I am on my third temperature sensor and not A single one has worked when in the water pump. the last one I put in I tested first by grounding it and connecting the wire to it then taking a lighter to the end. the gauge shot up. then I put the sensor in the pump and the gauge doesn't move a hair. any advice?