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I checked voltage at the fuel gauge. There is a 50 Ohm sand cast resistor going from the harness to the oil gauge with a brass buss linking to the fuel gauge. Voltage with switch on but engine not started is 5.9 volts and then when the engine starts voltage drops to around 3 volts. Oil pressure...

1947 Mercury 12 volt positive ground. Original gauges. Getting back to this project and ignored non working fuel gauge for a long time. I thought the gauge wasn't working but noticed that when I flip the ignition switch on the gauge works until I start the engine and then it stops working. I...