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Author Topic: Where is the oil pressure sending unit on a 258?  (Read 2931 times)

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Offline macdude443

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Where is the oil pressure sending unit on a 258?
« on: May 13, 2013, 05:37:02 PM »
Looking to connect the gauge package harness.  I know where the 3-prong switch is on the passenger side above the filter.  Also, what would the purpose of the sending unit be if the car didn't originally have an oil pressure gauge?  I believe the Oil light is wired to the oil pressure switch, as is the choke.

Offline vangremlin

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Re: Where is the oil pressure sending unit on a 258?
« Reply #1 on: May 13, 2013, 07:25:08 PM »
The oil pressure switch, or sending unit, for is located right behind the oil dipstick.  It controls the Oil idiot light in the instrument cluster.  You will need to get a different type of sending unit for the gauge.  They are readily available and relatively cheap from any parts store.  Just tell them the year and engine and specify that you need the sender for the gauge.  You can do some minor plumbing changes so that you have both the idiot light and the gauge operational.  Good luck.
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

Offline macdude443

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Re: Where is the oil pressure sending unit on a 258?
« Reply #2 on: May 13, 2013, 10:07:13 PM »
That's exactly what I needed to know.  I assume there is some sort of tee I can install?

Offline vangremlin

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Re: Where is the oil pressure sending unit on a 258?
« Reply #3 on: May 13, 2013, 10:23:44 PM »
Yes, that's what I did on mine.  i think I got the pieces I needed from a local NAPA store.
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

Offline BenM

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Re: Where is the oil pressure sending unit on a 258?
« Reply #4 on: May 14, 2013, 10:55:05 AM »
That's exactly what the factory did if you had an oil pressure gauge.


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1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline macdude443

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Re: Where is the oil pressure sending unit on a 258?
« Reply #5 on: May 14, 2013, 10:30:15 PM »
Seems simple enough.  I stopped in at advanced today to pick up a pressure sensor and they had two.  One was for cars with a tach and one for cars without.  They looked about the same, but the electrical termination was slightly different.  One had a clip-looking thing and one had a standard thread with a nut.  Any idea which one to use?  My car had a tach but it never worked, so I can't remember if it was connected.  Also, I changed to an HEI and never used the "Tach" terminal, so how would that effect this sensor?  I'm a little lost.  I assume with the wrong sensor the gauge won't be accurate, if it works at all.

Offline BenM

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Re: Where is the oil pressure sending unit on a 258?
« Reply #6 on: May 15, 2013, 11:19:53 AM »
They're supposed to have the same resistance, the only difference should be the terminal, and it's probably related to the wiring harness installed for the different options packs as the rally gauges were a separate wiring harness.

Grab your voltmeter, it should read 60 ohms at 0 psi between the terminal and the case. That way you know it's the right part.
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1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline greymarooneightytwo

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Re: Where is the oil pressure sending unit on a 258?
« Reply #7 on: May 15, 2013, 01:00:37 PM »
I put a mechanical oil pressure gauge in my car, there is literally a tube of oil going from a mechanical pressure sensor and then into my dash.

Works flawlessly.


Offline carnuck

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Re: Where is the oil pressure sending unit on a 258?
« Reply #8 on: May 17, 2013, 03:44:15 PM »
Unless the tube bursts and soaks your leg with boiling hot oil at 70 mph!
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline greymarooneightytwo

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Re: Where is the oil pressure sending unit on a 258?
« Reply #9 on: May 17, 2013, 03:59:08 PM »
It's hard plastic and 60psi shouldn't provide enough to crack it...

I was actually more worried about it leaking at the gauge and getting oil on the carpet, I have enough leg hair to insulate myself from any semi-serious burns ;)

Offline carnuck

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Re: Where is the oil pressure sending unit on a 258?
« Reply #10 on: May 17, 2013, 04:30:19 PM »
I thought I did too until I got first degree burns while cruising the highway! It popped the fitting off at the gauge because it was factory crimped too tight and heat/flexing/age broke it.
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline vangremlin

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Re: Where is the oil pressure sending unit on a 258?
« Reply #11 on: May 17, 2013, 10:20:51 PM »
I thought I did too until I got first degree burns while cruising the highway! It popped the fitting off at the gauge because it was factory crimped too tight and heat/flexing/age broke it.

Dang Carnuck, you've taken some heavy hits when it comes to your encounters with cars!  You are one tough eagle lover!
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

Offline carnuck

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Re: Where is the oil pressure sending unit on a 258?
« Reply #12 on: May 19, 2013, 12:14:25 AM »
What can I say? I'm a survivor. I've been shot, stabbed, beaten, fallen from trees and a cliff, run over, had a car fall on me, 7 major accidents (including going through a windshield at 16 and rolling my Jtruck on my "driveway" and my racecar at 120 mph and run off the road on my uncle's Triumph Bonneville 750 turbo motorbike) but I'm too stubborn to give up. ;)

Oh, and a nasty divorce too.
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline vangremlin

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Re: Where is the oil pressure sending unit on a 258?
« Reply #13 on: May 19, 2013, 01:13:52 PM »
What can I say? I'm a survivor.

You definitely are, and you should take that as the ultimate compliment!
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

 

Oil pressure switch for guage

Started by marty

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Last post June 30, 2011, 04:43:01 PM
by AMC of Houston