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1986 505 Turbo - Testing Oil Level Circuit


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I have finally replaced the oil pressure switch on my 505 Turbo, and now the Oil Level gauge lights up, along with the oil pressure, high temp, and STOP lamps in the cluster prior to starting the engine. That's all normal, but the oil level is not accurate, as the gauge just sits at the bottom of the range, which doesn't match the dipstick.

This begs the question: How can I check the wiring and the sensor to see if they are working properly? I don't want to order up a sensor and gasket, just to find out that the problem lies elsewhere.

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