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Quote:
Originally Posted by v8nut
I am not seeing any oil pressure on the gauge on my 35 Phaeton. I don't think the oil pressure is zero. I assume the sender is a variable resistor and the gauge is an ammeter. I have a multimeter to measure the resistance. What readings should I expect? Or, should I test the gauge unit first? If so, how? Any advise would be appreciated. Jim in San Jose.
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Your assumption would be incorrect. Modern sending unit work that way, but flathead era senders were current pulse devices. There is a heater coil in the sender and another one in the gauge. The pressure of the sender varies the current pulses which in turn varies the heat in the coils. The heater coil in the gauge heats a bi-metal strip which moves. This movement is what provides the needle movement.
I would not run the engine again until a mechanical oil pressure gauge is installed just to be sure. It is a good backup as well. I can be located in the glove box if more original dash appearance is an issue.