I posted a tread for an overheating issue earlier. Now I'm posting for another friend. We just got done putting a new motor in and now the coolant temp gauge is dead and so is the ecm coolant temp. We checked it on a scanner with the truck running and warm and it read -40* on the scanner. We have changed the sensor with no change. Didn't think it would do anything anyway. Also, on one side of the plug it reads 7-8 volts but the other reads nothing. Anyone ever have this issue? any help would be great.