My stock temp gauge is not working. I have replaced both coolant temperature sensors. I have unplugged the sensor that sends the reading to the gauge and grounded the plug, and the gauge spikes hot. When I am cranking the truck it spikes hot. But when the truck is actually running it has no reading at all. I have looked all over for information but cannot find anything, so if this has already been answered just point me in the right direction and delete this post. It's driving me crazy trying to figure this out. Thanks in advance!