Shouldn't your hot wire go from the ignition to the gauge then from the send terminal on the gauge to the sending unit and if the tank has a questionable ground run a wire from the sending unit to a ground. I have never seen a chevy with the hot wire going straight to the sending unit. Chrysler wired thier gauges different and they didn't use a float on their sending units
Been there, Done that, Hope to live long enough to do it again.
Big Bill
I.I.# 4698
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