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Where is the oil pressure sending switch on a 1989 GMC Sierra not the fuel pump relay?
Wiki User
∙ 14y ago
The oil pressure sending unit on a 1989 GMC Sierra is located slightly above the oil filter. You will need a flashlight to find it. It may be hard to recognize it because it should have a heat shield around it as well. Look for its wire coming down from the engine compartment and follow it to the oil pressure sending unit. Drain your engine oil and remove the oil filter to make changing the oil pressure sending unit easier.
Wiki User
∙ 14y ago
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