Step 1F: Oil pressure switch
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Oil pressure switch: Connect the one gray wire to the oil pressure switch located on the left side of the engine. This wire is in the middle of the harness and I choose to drop it down on the left side of the upper frame member to the oil pressure switch. Originally the oil pressure switch accepted a 4 mm male bullet terminal. The common replacement accepts a 4 mm female bullet terminal.
Connections - oil pressure switch
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Photo courtesy of Gregory Bender.