The ground has a pitiful torturous journey back to the battery. The sender has a gasket. The tank may have pads. The body has rubber pads. The motor is mounted on rubber....and sometimes paint along the way. The path: Tiny sender screw threads to crimped terminal to frame. Frame to body. Body to motor. Motor to battery neg post. So there are several jumpers used that jump across the rubber and questionable bolt contact. That's what those braided straps do. Those need to be double checked.
Always test a new gauge and/or sender to each other OUTSIDE the tank before installing. To be sure you get a reasonable reading. Then if you have trouble after intstall, you know its wiring.
Last edited by bartamos; 02/15/2025 9:27 PM. Reason: clarification
