The Stovebolt Site Forums The Shop Area The Electrical Bay Temp Gauge Frustrations - 57 3100

The gauges are mounted to little plates and the plates are mounted to the cluster rear plate with screws. Use those screws or a perimeter screw. I have been fooled before, just touching a surface to test ground. Not enough contact most times. You can hang the cluster with string or wire from the steering wheel to work on it if you have enough "service loop" or create one. When sender wire is grounded is reads hot, maybe it is getting grounded somehow or you have a warning light sender, those senders are more of an on/off switch to light the light at a set temp. 1966 did have warning lights!!!!! I think Warning light sender has two blades and gauge sender has one stud terminal.