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I need assistance with the dash fuel guage on my 1955 Clipper= when a volt meter is put on the lead coming from the dash guage, the voltage pulsates from zero to 12 volts in a steady stream- (like a clock ticking) is this correct? should the voltage be constant 12 volts? I am installing a new tank sending unit and I don't want to mess it up

The gauges are actually 5v and there is a voltage regulator on the back of the cluster that chops up the incoming voltage to get to 5v. What you are seeing is the oscillating of that "chopper" style voltage regulator.

Thanks Kev