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Old 07-10-2010, 11:52 AM
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oil pressure switch/sending unit

My oil pressure gauge is pegged all the time. I was told to change the sending unit however the auto parts store gave me a pressure switch and quadratech sent me what i think is the sending unit. the "sending unit" and "switch" are linked. i think found the "pressure switch" location near the oil filter. but i'm not sure i found where the "sending unit" is. i found something that might be it near the serpentine belt on the driver side and looks like it connects to a tube that runs under the radiator. so i'm a little lost. where is and which is the "sending unit" vs. where is and which is the "switch".

I have a 2.5L 4cyl 93.

any help is appreciated.
The Captain is a one eyed Dwarf, who's throwing dice along the wharf. In the land of the blind the one eyed man is King. - Tom Waits
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Old 08-22-2010, 12:33 PM   #2
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This may or may not help at all since we have different motors. But my gauge stays pegged as well. It pegs when turning the key on and stays that way until after shutdown when it drops about 10-15 seconds later as presumably the oil pressure bleeds down.

But on my 4.2L inline six, I found the oil pressure sender and an oil pressure switch siamesed on one fitting near the rear of the block - further back than the crappy pics in the Haynes Manual would have you looking. In my case, the switch supposedly controls electrical current to the carb choke heater. It has a two-wire plug. The much larger pressure sender has a single wire connector

I just looked at a pic of the 2.5L 4-banger and what looks like my oil pressure sender is on the right side of the block between the distrubutor and the back of the alternator. These are the biggest oil pressure senders I've ever seen - they look more like small inline fuel filters.

Good luck!

Mark J
Merritt Island, FL

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Old 08-27-2010, 10:03 PM   #3
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Your old sending unit is on the underside of the engine, the passenger side of the machine, below the oil filter. It's black and about 1.5 inches long.
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Old 08-28-2010, 12:25 AM   #4
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chensley: Your old sending unit is on the underside of the engine, the passenger side of the machine, below the oil filter. It's black and about 1.5 inches long.
I've been having the exact same problem in a 91 Jeep 2.5 .

I replaced the sending unit on the passenger side right next to the distributor cap and the oil filter. But, the oil pressure gauge 'pegs out' on the highest pressure after the engine is running.

The Oil Sending Unit is new, but the gauges don't read properly?
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Old 12-12-2010, 04:50 PM   #5
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Just a bit off topic but I just replaced my sending unit (for gauges) on my 91 wrangler 4.0 which resides next to the oil filter. The old one was puking oil everywhere, but out of the unit itself not where it screws into the block. (whats up with that!?) Anyway the sending unit they (oreillys) gave me has an oval shaped 1 round pin connector. The pigtail on the jeep is a round boot spade connector. Oreillys says its the only sending unit they show for a wrangler with gauges. Does someone make an adapter or do I have to rig this thing myself. Is it the wrong sending unit? Any help guys. Thanks
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Old 12-12-2010, 05:15 PM   #6
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Add me to the list. 95 YJ 2.5 engine. I just started to drive it a week or so ago. Frame and bodywork after purchasing it. I noticed the gauge pointing to 80psi. I checked the oil and it was over the full mark. Saturday I changed the oil and filter. I put in 4 qts ran the engine for a second and checked it again. It showed almost full so I only added half a qt more it now shows topped off. Is that right? It only takes 4.5 qts?

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