Have a 93 6.5 diesel, temp gauge hasn’t worked since I bought it. When you go to turn it over it pegs out then dies again once starter is disengaged. Replaced sender with no luck. Doesn’t peg out when grounded either. Checked the prongs on the back of the dash and bent them a little to make better contact. Still no luck. Is there another sensor for the temp gauge I’m not finding somewhere?