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look just to the left of the power brake booster (drivers side), on the very back of the intake, you should see it, it will be sticking up, coming from the manifold, should have a connector with 2 wires on it. You will need a special socket (any auto parts store). If you try to use a normal socket or wrench, you will most likely damage/destroy the sending unit. these commonly go bad, and can cause numerous problems, such as a unexplained oil leak, guage not working, idiot light blinking/coming on, or even keeping the engine from running. if there is no oil pressure after starting the engine, it will not allow the fuel pump to operate.

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Q: Where is the oil pressure switch on a 4.3 S-10 blazer?
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