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Originally Posted by piecesparts
My truck (84 GMC) and my son's truck (86 Chevy) both have an oil pressure sending unit on top of the engine and a switch on the driver's side of the block (right above the oil filter). The sending unit on top is for the oil pressure gauge only and the unit on the bottom of the block is a pressure switch on/off unit for the engine.
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Mine are both on top of the engine on a brass "T" fitting.
Slonaker