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Unread 12-18-2011, 07:52 AM   #1
Deepair3
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Help! I am an Oil Pressure sending Unit and I am lost!

Guys in the Wrangler Forum told me to try here...
Trying to wire the Oil Pressure sending unit on my newly purchased 88 YJ. It has an AMC 360 and I have searched online and around the engine and I can NOT find the canister sending unit. I have found the switch above the Oil Filter, but am at a loss as to where the sender is. Please help. Also does anyone know which wire coming from the firewall is from the Gauge? I think the Green one.....

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Unread 12-18-2011, 11:58 AM   #2
MikeW77
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The sending unit is just above the oil filter. I checked and my wire is either purple or brown. Hard to tell because of its age. Could have even been orange at some point. Go to oljeep.com for complete wiring diagrams. However, it may or may not apply in your situation. That depends on whether or not the harness was transplanted with you engine swap.
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Unread 12-19-2011, 07:04 AM   #3
Deepair3
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Ok, sending unit above the filter....We hooked up the green wire that it shows in Chilton for the Wrangler to be for the Gauge, and we hooked the other prong to a ground and the gauge went from reading 80 to reading zero. We are assuming that means the sending unit is bad. It had been reading 80 when the jeep was running. Any suggestions on removing and replacing that sending unit? Wait until I change the oil or will a socket fit around it with out removing anything? Also, will this leak a bunch of oil if I remove it before doing an oil change? I know this sounds pretty rookie... But thanks!
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Unread 12-19-2011, 07:38 AM   #4
muddy93
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Quote:
Originally Posted by Deepair3 View Post
Ok, sending unit above the filter....We hooked up the green wire that it shows in Chilton for the Wrangler to be for the Gauge, and we hooked the other prong to a ground and the gauge went from reading 80 to reading zero. We are assuming that means the sending unit is bad. It had been reading 80 when the jeep was running. Any suggestions on removing and replacing that sending unit? Wait until I change the oil or will a socket fit around it with out removing anything? Also, will this leak a bunch of oil if I remove it before doing an oil change? I know this sounds pretty rookie... But thanks!

My Grand Wagoneer is an 87(AMC 360), but it only has ONE wire for the oil preasure sending unit/gauge.

You mentioned that the gauge "had been reading 80 when the jeep was running." If we were talking about a stock wagoneer, this would indicate that the sending unit was not hooked up, or there was a break in the wire.
And, the fact that it's now reading zero, makes me think that the sending unit wire has been grounded. (like maybe the wire that you hooked to ground, should have gone to the sending unit).



In a stock wagoneer, If the oil preasure gauge sees full ground, like if you unhooked the wire from the sending unit, and touched it directly to the block, or frame, the gauge would read ZERO. And, if you just unhooked it all together, so the wire was not touching anything, the gauge would peg all the way at 80.
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Unread 12-19-2011, 11:07 AM   #5
Deepair3
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Ok... Mine has two male ends coming out of it. The gauge was reading 80 when it was unhooked. I have again unhooked it. If the second prong isn't a ground what is it? Dashboard light? ANd if so any way to tell which one goes to which?
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Unread 12-19-2011, 12:07 PM   #6
muddy93
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OK, sense the engine has been swapped into the wrangler, I have no way of knowing what was kept stock, and what has been changed.

In stock form, there should be TWO seperate things neer the oil filter, that have wires attached to them.
The OIL PRESSURE SENDING UNIT (this makes the gauge work) , it's "can" shaped, with ONE wire connecting to it.

The second is the OIL PRESSURE SWITCH (This prevents the electric choke from activating unless there is oil pressure). It is kind of "flat disk" shaped, and has TWO wires connecting to it.

Here's a picture (88 grand wagoneer with 360)that I found online, the sending unit(for the gauge) is on the left. The switch (for the choke) is on the right.


EDIT: Seeing that you recently purchased the jeep, does it have aftermarket gauges?
Are there any small tubes coming from the engine, and going through the firewall? If someone added a mechanical oil pressure gauge, it's possible that they removed the stock sending unit.

I didn't drive my jeep to work today, but I can take a look when I get home and see what colors the wires are on both the sender and the switch.
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Unread 12-19-2011, 12:19 PM   #7
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BINGO!

Ok that is what I needed! Mine has only the switch, which I don't know that I need. I have an edelbrock carb. unless someone can tell me how. Will the sender ( bell shaped ) fit in the switch's location? I so appreciate your help so far. We spent a few hours yesterday cleaning up the wiring. This is the only gauge that doesn't work.
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Unread 12-19-2011, 12:22 PM   #8
muddy93
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As long as the threads are the same, it should fit.
Just take the switch out and take it with you when you go to pick up the sending unit. compare the threads before you purchase.
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Unread 12-19-2011, 12:28 PM   #9
Deepair3
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It's not going to leak.... I used to have an old 260Z and I replaced that one a couple times and it didn't.
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