Just to muddy the sender water, and maybe a smart electrical guy can correct my memory....
I have a back-up sender mounted in my swirl tank, and I had to run a separate ground from the tank body to chassis ground, as the tank was mounted with rubber hoses and a rubber standoff.
I just can't recall if no ground, therefore high (infinite) resistance made the sender read high or low. I am sure it read WAY off with no tank ground.
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