There should be a wiring diagram on this site. Find out for sure which post the "Hot" wire goes. Then even if the other wire is dead grounded it should not hurt the gage. If then the power wire gets hot, then you have a short in the gauge or a ground to the hot post of the gauge. I think my 57 goes to FULL when the sending wire is dead grounded. It has a spade plug to the gage, so I cannot explain which post is the hot post, but I think it is the one behind "empty" as mentioned above.
Last edited by Old GMC Gold; 08/22/2014 4:15 PM.
