Dual Oil Pressure Switch? - JeepForum.com
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post #1 of 5 Old 03-04-2002, 08:55 PM Thread Starter
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1986 CJ7 
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Question Dual Oil Pressure Switch?

OK... On my '86 CJ-7 with the 258 (4.2) I have found TWO oil pressure sending units! One is the "big metal can" that sends the signal to the gauge, the other looks like an "idiot light" switch. Does anyone know what this extra Oil Pressure switch does?


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post #2 of 5 Old 03-04-2002, 10:53 PM
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1971 CJ5 
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Are you sure the small one isn't the temp sending unit?

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post #3 of 5 Old 03-05-2002, 09:01 AM
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Ya i think he is right if the little one is tword the back of your engine on the driver side its the temp sening unit.. to be shur unscrew the little one you shoud see radiator fluid in the hole if youdo thats the temp sender...

Thomas Mintz
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post #4 of 5 Old 03-05-2002, 09:17 AM
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My CJ had 2 oil pressure sending units also - Seems the P.O. had added an aftermarket gauge and instead of removing the old one, just plumbed the new sending unit into the mess. Bottom line - get rid of the extra one!


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post #5 of 5 Old 03-05-2002, 10:17 PM Thread Starter
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Hate to break it to you guys... Mine REALLY does have TWO units. One is the large can that operates the gauge in the dash. The other is the "on-off" switch type, and they are BOTH original equipment. There is a brass splitter screwed into the engine and both units are screwed into two holes in it. The wiring and all is definitely original and unmodified.

My NAPA parts buddy made a guess until we can get a repair manual. He thinks the "on-off" switch only allows current to the electric choke heater when there is oil pressure. Says it keeps the choke element from heating up when you just have the key in the "on" position without the engine running. I am sure the service manual will solve this mystery!

I'll let you know when I find out what it does!

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