Where do I find the temp sensor?So from what I understand, when I had problems with my gauge, the test was to touch the gauge wire to ground. If the gauge was good the needle would go all the way to the top. This suggests that the temperature sensor would lose resistance as it gets hotter (I could be backward on this 180 degrees). So the test for a sensor would be to put it in hot water and see if the needle went up, that is if the gauge was never moving at all.
So my guess is you have a short someplace and perhaps the connector at the temp sensor is touching the frame slightly.