The oil pressure gauge should move to zero and stay there when the key is turned on without starting.
The oil pressure sensor loop is a simple variable resistance loop. Dual stations use two gauges in parallel so the sensor resistance is either twice or half that of a single depending on manufacturers.
Find the sender and disconnect the wires and measure the sensor resistance. The reading should be steady. If so connect a resistor to the sensor leads of about 100 ohms. The gauges should read somewhere onscale and steady. If so have someone watch the gauges while you gently wiggle the wiring harness from FB to engine.
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Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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