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To put your 24mm deep socket and ratchet on the oil pressure switch, you must remove the alternator cooling duct, HFM and intake manifold support bracket. I stuffed a paper towel in the alternator cooling duct so I wouldn't drop hardware or tools into it. Do this while the engine oil is drained (necessary to install the temperature sender, which replaces the engine oil drain plug). I placed a small funnel with a long tube on it to catch oil that leaked out when the pressure switch was removed, but it was only a few drops.