Possibly had a bad ground connection IN the hanger assembly. wiggling the harness gave me some fluctuating resistance so I depinned the connectors and tightened up the pins. Solid ground connection out of the tank, and checking the rear harness ground wire to the negative battery terminal showed a good connection. This makes the most sense as it is the only common connection between the pump and the fuel gauge sender.
I'm getting around 7-8 volts at idle and around 10.5 with the resistor jumpered. Its running ok now, but it always starts and runs for a while.
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