The wire connection at the sender (where I show the insulation washer) must only make contact with the stud and nut. The insulation washer prevents contact with any other metal. A friend of mine observed drastic changes in his fuel gauge needle when making slow turns left and right. New sender didn’t solve the problem. His insulation washer was not installed in the proper location. The round mounting plate should have a ground wire that grounds the unit to the back wall of the cab. If the gauge wire has contact with the area that is grounded, then the gauge will not work properly. You could make a small washer from a yoghurt lid and it would work the same.
Last edited by Lugnutz; 05/03/2022 4:01 PM.
