Trans temp gage grounding issue
I installed a B & M trans temp gage in my 72 Chevelle. Its located on the return steel line from the cooler back to the trans. I wired it per the instructions, Switched Power, Sensor and a wire to eluminte the light. The gage works fine (minus the back light) until I land the ground wire on the gage. Once I do that, the back light eluminates and the temp gage drops down to zero.
Would anyone have any suggestions?