Is the fuel gauge 100% original to the car? Is it GM? I would need to know the exact year and model of your car to quote specks on that. ![]() The sender does not read strictly by voltage it is a variable resistor that changes ohms due to fluid levels. Tan wire (key on) about 3 volts or 3.5 volts maximum. You have 12 volts + in (key on + power) but the exit wire (tan) is resisted due to the coil winding inside of the dash unit. The tan wire does carry some voltage as it's exit path out of the rear plug on the back of your gauge but not 12 volts. Finally there is a black wire on the sender that grounds to body ground underneath your trunk floor. Then 1 tan wire from the back of the gauge thru the body harness (including several plug-in connectors), on back to the trunk, underneath the car, to the sender. ![]() So the circuit is: 12 volts + battery power thru a fuse (key on) body ground at the rear steel mounting panel behind the dash where the gauge mounts. Inside of that gauge there are 2 wire wound coils.
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