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Old 06-24-2012, 06:47 AM
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The fuel tank sender is grounded near the tank. At the gauge there will be ignition-switched 12 volts on one side of the gauge, and the wire on the other side runs from the gauge to the sending unit. When power is applied to the gauge it is grounded through the sending unit, so it measures the resistance of the sending unit (which is proportional to the gas in the tank).

TH350 is a very common speedometer cable connection, but I don't know about the other side where it connects to the speedometer head.

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