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oil pressure gauge
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garweb3 View Drop Down
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Joined: Jan/01/2009
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    Posted: Jul/04/2022 at 5:11pm
My oil pressure gauge in my 1980 Spirit AMX suddenly stopped working. It reads in the negative range with or without the sending unit plugged in. It does this when the car is running or with the key turned to run or accessory and not running. Problem?
1974 Javelin AMX
1980 Spirit AMX
1987 Jeep Comanche Sportruck
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Heavy 488 View Drop Down
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Points: 3552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/04/2022 at 6:11pm
Ground the sender wire from the plug and see if it goes all the way high
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Points: 3059 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fluffy73 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/04/2022 at 9:53pm
If grounding the wire pegs the gauge, it's not the gauge - it's the sender.
Sadly; they fail. I myself have gone through several in my Hornet and at least 3 on my humpster over the years.  It's just the nature of the beast.  A rubber diaphragm that moves and distorts with oil pressure and heat and everything under the hood. 

Just be sure to get the right one for your Spirit.  There are two types.  You want the later Spirit, Spirit/GT, Spirit/AMX or Hornet/AMX style.  Uh, PACER would also use the same time with gauge.
I am genetically incapable of being Politically Correct.
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garweb3 View Drop Down
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Points: 363 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garweb3 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 4:04pm
There is more than one wire on the sender. One single one on the top And also a plug on the lower part of the sender. Which wire needs to be grounded?
1974 Javelin AMX
1980 Spirit AMX
1987 Jeep Comanche Sportruck
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Points: 347 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MIPS Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 4:08pm
You might be seeing the sender, which is the single wire, and the Oil Pressure Switch (multiple wires and a plug) being attached to the same port on the block.
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garweb3 View Drop Down
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So ground the single wire?
1974 Javelin AMX
1980 Spirit AMX
1987 Jeep Comanche Sportruck
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Points: 347 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MIPS Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 4:15pm
Yes. Ground that wire to anything.
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garweb3 View Drop Down
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Points: 363 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garweb3 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 4:18pm
Thanks I'll give it a shot tomorrow.
1974 Javelin AMX
1980 Spirit AMX
1987 Jeep Comanche Sportruck
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mstrcrftr View Drop Down
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Points: 2066 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 5:00pm
Originally posted by garweb3 garweb3 wrote:

Thanks I'll give it a shot tomorrow.


 a word from the wise..  i would have two people doing this.. one to look at the gauge and one to ground it.   you do not want that wire grounded for any length of time or it will burn out the gauge.  it should not take more than one second.  you will see the gauge move.  thats all you need to know, is if it moves..

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Points: 26 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 79Spirit Quote  Post ReplyReply Direct Link To This Post Posted: Jul/05/2022 at 5:55pm
I would be going aftermarket for that critical measurement along with water temp. Those Spirit/AMX gauges were there more as a gimmick than actual measurement.
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