Fuel tank sending unit

Mike69cuda said

However the non linear winding on the potentiometer that is designed to compensate for the spare tire cutout is a big deal. That can’t be adjusted out by bending the sender arm.

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Technically it can, but the gauge won't read correctly. Bend the arm so that when the tank is almost empty, the gauge indicates empty. It will just stay on full forever, and then start rapidly dropping once the level gets low enough to move the float. It's what I've done in the past so I knew if I had gas or not.