I want to buy a new oil pressure sending unit for my '91 XJ. The 'replacement' I bought from AutoZone is crap; the needle will wiggle inconsistantly up and down, ranging from a 1-3 psi difference to as much as 10 psi changes. I called my local Jeep dealer, and they insist all they can find is a $12 sender, which I am 100% sure is for the dummy light. I tell them I have a gauge, they say 'oh well'. So, where do ya'll get your replacement senders from? I want to be as close to OEM as possible. Thanks!

 

You should consider that maybe your oil pressure is changing that much or maybe you have wiring issues like a bad ground, broken wire etc.

 

I plan on pulling the gauge bezel and the cluster to check all grounds. I've traced the wire from the connecter and it's solid.

 

I have found that napa replacement parts have been good to me.. you could always go to the dealer...

 

Are the ones from NAPA any good?

 

i can't tell you i have never brought one from there for that sensor... i have gotten tune up parts there and they were good... for a sensor like that i usually get mopar if i can...

 

I have actually just bought one from autozone too. THEY sold me the Dummy Light. However, my reading was just spiked >80 the entire time. So the fact that you get readings makes me think you have the right one.

I went and bought one from Advanced Auto and it has been solid so far. I have heard a lot of guys say buy a quality one though as it is well worth the money. I'll send the link to my other thread that had all the info

 

https://www.cherokeeforum.com/f2/oil...-switch-78481/

Here ya go man. This might help you when you buy a new one and compare. They might have sold you the wrong one and that might be why you get those readings. But i'm not an expert... So good luck!

 

get A mechanical oil pressure gauge its way easy and works good

 

I just bought one today for my 97 from AutoZone and it worked perfectly.

 

amen to that... if I had not tried a mechanical would still think I was making like 15psi on the highway... lol

 

I buy plenty of aftermarket parts, but the oil pressure sending unit is one piece of hardware that I always buy directly from the dealer. It is worth the extra money in providing the best reliability/accuracy/mating with your factory gauge.

There are plenty of threads of people with problems with some (not all to be fair) aftermarket oil pressure sending units. A few guys have had to try up to three aftermarket sending units before they bailed out and went to the dealer for this part.

I personally have had reliability issues with aftermarket sending units, so won't use them or recommend them any longer. I have also used my mechanical gauge to check accuracy on some aftermarket sending units and have seen some pretty disturbing pressure variations on some of them, which went away with a Jeep unit.