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Unread 02-15-2010, 05:24 PM   #1
shansel88
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1990 YJ Wrangler 
 
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Oil Sending unit location

I know this may be crazy, but I cant seem to find the oil pressure sending unit on my 1990 wrangler. I believe I may have located it on the passenger side of the motor, between the oil filter and the firewall? If so does is have two connectors on it and a black snapped cover around it?? If this is it what is throwing me off is the one I just purchased only has one connector???? Are they interchangable??? Two connectors vs. one??
Thanks again for the help!

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Unread 02-15-2010, 05:31 PM   #2
Fhajad
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What's your engine first of all? Fill out your profile, it's super helpful.
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Unread 02-15-2010, 05:35 PM   #3
shansel88
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Sorry, it is the six cylinder motor. 4.2 I believe.
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Unread 02-15-2010, 05:35 PM   #4
Mean Max
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Here is the oil pressure sending unit on my '91 YJ, it should be the same for yours.


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Unread 02-15-2010, 05:45 PM   #5
shansel88
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Thanks for photo, but they must have changed in 1991. Mine is not in that location. Anyone have any more info??? for maybe 89-90??
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Unread 02-15-2010, 06:24 PM   #6
jaminb
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it should be right behind the oil dipstick. towards the firewall. It will have an elbow connector and to sensors. One is for a light on the dash and the other that looks like cylinder is the sending unit for the oil pressure gauge.
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Unread 02-15-2010, 06:35 PM   #7
kloppk
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Max's picture above is for the 1991 & up 4.0's.
The 4.2's were different. They have 2 pressure sensing units.
Your setup should look like this...
#1 Is the pressure sensor for your dash oil pressure gauge
#2 Is the pressure switch for the electric choke

The two are not interchangeable.
#1 provides a variable resistance proportional to the oil pressure
#2 is and ON/OFF switch controlled by the presence or absence of oil pressure
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Unread 02-15-2010, 06:44 PM   #8
rustywrangler
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Quote:
Originally Posted by kloppk View Post
Max's picture above is for the 1991 & up 4.0's.
The 4.2's were different. They have 2 pressure sensing units.
Your setup should look like this...
#1 Is the pressure sensor for your dash oil pressure gauge
#2 Is the pressure switch for the electric choke

The two are not interchangeable.
#1 provides a variable resistance proportional to the oil pressure
#2 is and ON/OFF switch controlled by the presence or absence of oil pressure

He be right:
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Unread 02-16-2010, 05:11 PM   #9
shansel88
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Thanks for the pic. Changed it out and fixed the issue. Thats one more problem down only a few more to go!
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