Quote Originally Posted by TUSHHOG View Post
Sound's like your Nav. Lights are robbing the ground from your gauge. Try putting a temporary jumper from the gauge body mounting bracket to a good known ground.
Just my 2 cents, which don't mean much on here!!!!


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This could very well be the case. If you have a ground wire piggy backed from the Nav lite switch to the gauge, move it to another ground location. Just trace the black wire from the fuel gauge and let us know where it runs to.


BRM