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Look directly under the Power Steering pump and you will see the oil pressure switch threaded straight into the block. If you were looking at the front of the engine from the hood, this would be on your lower left. Unplug the connector and then you will need a 1-1/16" open end wrench to unthread the switch, then install the new one. Fairly simple, just a bit of a pain to get to. Only cost about $35!

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Q: How do you change oil pressure switch 1995 Chevy 2500 454 4x4?
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