Oil pressure sensor, 1988 GT (Page 1/1)
John W. Tilford DEC 27, 05:03 PM
Amazon delivered an oil pressure sensor I ordered yesterday. I was impressed until I opened the box. The sensor body's the same size, thread looks right, but there's only one male pin. The old one had three male pins. The female connector wired to the harness has three female sockets.

Will this one pin thing work? I'm assuming the gauge is somehow connected to chassis/engine ground.

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John W. Tilford

Gall757 DEC 27, 05:49 PM
The 88 sensor is not the same as earlier years, and should look like this:

[This message has been edited by Gall757 (edited 12-27-2021).]

John W. Tilford DEC 27, 06:14 PM
Looks like that, but with one central pin.

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John W. Tilford

theogre DEC 27, 11:23 PM
Is Not the Right unit.
May work if 1 pin is pin A using the Tan wire.
But this is missing the F-pump power switch to "backup" the F-pump relay.

Example for Right one see https://www.rockauto.com/en/moreinfo.php?pk=945025
But RA list Standard PS241 is wrong picture or number showing old type sender and not fit 88.
(Right one is PS245 if uses 0-90 Ω https://www.rockauto.com/en/moreinfo.php?pk=44300 listed 90 GA 2.5l Not digging thru GM # shown or searching other places.)

Side Note:
Lisle Oil Pressure Switch Socket
If does fit, may help people when sender is in tight places.
Watch videos at https://www.amazon.com/Lisl...Socket/dp/B0002SR2RY

Note: All posts RA info pages...
copy/past the link from address bar.
Cut off the link at first &
So End now is ?pk=xxxxxx like above

This works for PFF auto-linking.
Similar cutting off a link from Amazon and some others...
example https://www.amazon.com/WVE-...essure/dp/B07DVWSZ9T
Ends at... WVE-NTK-1S6635-Engine-Pressure/dp/B07DVWSZ9T
More if any start with /ref= is used to track users etc. and not needed here.
John W. Tilford DEC 28, 06:35 AM
Thanks ogre!

On way to NAPA to ask for GM 12555492. I'll take a good look at what they've got before buying. The links you supplied are obviously correct and include "3 terminal" in the descriptions. Will order if NAPA does not have or if too expensive. I did get the special socket tool from Amazon and it fits the original perfectly. Other posts on the Forum reminded me to use a small wrench below the sensor to protect the tube/bracket.

That's what I get for selecting items on Amazon by looking at pictures . . .

[This message has been edited by John W. Tilford (edited 12-28-2021).]

fierofool DEC 28, 08:57 AM
You can usually get the Standard brand at O'Rielly and it's much cheaper than NAPA.
John W. Tilford DEC 31, 10:44 AM
New oil pressure sensor/sender installed. Works. No leaks so far.

In order to torque enough to get the old sensor base out and tighten the new sensor down, I took out not only vent grill but also the battery and black plastic "battery box end" that the positive cable goes through. Gave me plenty of room to hold the threaded rectangular base for the sensor with a crescent wrench to counter the remove and install torque. Did not want to mangle the bracket or tube.

To get really sophisticated, I put a two-by-four between the crescent wrench handle and first the firewall to counter removal torque and then against the battery "clamp" (adjustable to match width of battery) to counter install torque. However, the two-by-four was not calibrated. I'll probably have to go back and redo when I get a calibrated two-by-four.

Well, my new year will be a bit better. I hope every Forum member can say the same! Thank you all for the advice.