oil pressure switch on 368

1981 CADILLAC DEVILLE
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COUPEDEVILLN
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Engine Performance problem V8 Two Wheel Drive Automatic 90,000 miles

I can't find the oil pressure switch on my 368. Found a sensor on the back of the block, but had only one wire. From my understanding it should have at least 2 and the one from the parts store has 3. Can someone please help? I would really appreciate the help.
Oct 13, 2008 at 7:28 PM
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RASMATAZ
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It only has one male spade terminal on it


https://www.2carpros.com/forum/automotive_pictures/12900_getimage_3.jpg

Oct 13, 2008 at 7:41 PM
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COUPEDEVILLN
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My understanding is that it has 2 circiuts. One for dash light and one 4 the fuel pump. It's supposed to be a back up 4 the fuel pump relay. Is that wrong?
Oct 14, 2008 at 6:23 PM
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RASMATAZ
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Not too familiar with your model-Yes there's such thing as fuel pump/oil pressure sending unit-see below how its wired into the system


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_77.gif

Oct 14, 2008 at 6:30 PM
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COUPEDEVILLN
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The parts store got me the right one. Thanks. Now how do I find which relay is the fuel pump relay?
Oct 15, 2008 at 8:53 PM
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STRAILER
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The fuel pump relay is located on relay panel under instrument panel to the left of the fuse box.
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Jan 29, 2018 at 4:40 PM