Ben -
The "GM standard" for most of their fuel sending units is a simple signal between 0-90 ohms resistance in a pot-controlled circuit. As the fuel sending unit's level sensing arm goes up, impedance increases (maybe... could be the other way) and the needly thingy rises in the gauge.
Maybe if you put a controlled 40 ohm signal to it (at 12VDC) it will read ~1/2 tank? Couldn't hurt to try?
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