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Old 03-20-2011, 03:34 PM   #1
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Oil pressure gauge pegged.

Hi all, I just got everything on my motor back together and for some reason the oil pressure gauge is pegged high. Now there are two sesnors and I know a bad one could do this the one sensor has a blue and white stripe wire along with an orange coming out of it. the other sensor has a single one with just a redplug in wire on the top of it. Which on controls the gauge? If I put a test light on the sensor with the single wire on it the single wire will read hot with the key on. The blue wire on the other doesnt do anything when hooked to ground and the orange will read hot just like the other sender. Also none of this has any effect on the gauge reading.
Thanks dan

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Old 03-20-2011, 04:03 PM   #2
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what does the gage do with both wires disconnected?

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Old 03-20-2011, 06:28 PM   #3
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even with all the wires disconnected the gauge still stays pegged at high. which of the sensors control the gauge?
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Old 03-20-2011, 07:41 PM   #4
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what engine and year? on my 4.0 the sending unit is on the rh side. the wire is gray/yellow stripe.
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Old 03-21-2011, 10:47 AM   #5
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sorry guys i forgot to put that in there its a 1990 yj with the 4.2 in it. i bought it with a blown motor so i have no idea how the wiring was before i pulled the motor
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Old 03-21-2011, 11:25 AM   #6
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There should only be one Oil sender unit. near the rear of the engine on the Passenger side if I remember correctly. The wire should be Light Blue/green.
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Old 03-21-2011, 02:55 PM   #7
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My block has both of these on the right side of the motor Oil Pressure Switch | 1990 Jeep Wrangler 4WD 6 Cylinders T 4.2L 2BL | AutoZone.com the one with two prongs has a BLUE/WHITE wire and an Orange wire in it the other one has a single red wire? The red and the orange wire are hot at all times
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Old 03-21-2011, 03:05 PM   #8
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According to that page, the two prong one is for the idiot light and the single prong one is for the gauge. I'm gonna go double check mine.
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Old 03-21-2011, 03:19 PM   #9
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Okay here are the results (done with the key in run, engine not started):

If you take a wire and short the two contacts together on the double prong unit, it sets some relay in the engine compartment but the gauge does not change.

If you run a wire from the lead going to the single prong unit to the chassis ground, it will cause the gauge to go to zero.

So the one you need to replace is the single prong one. (as do I, these used to cost 60 bucks, I think I will replace it now that it is reasonable.)
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Old 03-21-2011, 03:46 PM   #10
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My 89 4.2 sending unit has one wire and is in the shape of a bell for a lack of a better term. I replaced mine 3x. They seem to work fine for awhile and eventually peg out. Most times mine works great after everything warms up.
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Old 03-21-2011, 06:26 PM   #11
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ok thanks guys ill try it and report back

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