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88 Dakota 3.9: installing aftermarket illuminated oil pressure & water temp gauges

Old Oct 6, 2018 | 07:24 PM
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Default 88 Dakota 3.9: installing aftermarket illuminated oil pressure & water temp gauges

I hope to install aftermarket illuminated oil pressure & water temp gauges on my 88 Dakota 3.9 in the near future. Oil sending unit is on the passenger side by the distributor, but I’m not for sure about the location of the water temp gauge sensor.
Any help & suggestions would be greatly appreciated!
 
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Old Oct 6, 2018 | 08:58 PM
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I'm not 100% sure, someone will correct me if I'm wrong, but I think it's on the top of the engine near the front, middle. Close to the thermostat housing.
 
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Old Oct 6, 2018 | 09:29 PM
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1988 3.9? Under the A/C compressor, passenger side, front of the intake manifold.

One wire there, so it's easy to tell from the ECT sensor for the ECU.

RwP
 
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Old Oct 7, 2018 | 02:15 PM
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Thanks RalphP! That’s what I was thinking. I should be able to install the aftermarket temp sensor there & run the capillary tube into the firewall for the gauge inside the truck.
What about the electrical connector for the oil pressure sensor?
Originally Posted by RalphP
1988 3.9? Under the A/C compressor, passenger side, front of the intake manifold.

One wire there, so it's easy to tell from the ECT sensor for the ECU.

RwP
 
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Old Oct 7, 2018 | 02:23 PM
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I dunno, what about the electrical connector for the oil pressure sensor?

I mean, what's your question about it?

RwP
 
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Old Oct 7, 2018 | 02:35 PM
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What do I do with it when I install the aftermarket oil pressure gauge?
Originally Posted by RalphP
I dunno, what about the electrical connector for the oil pressure sensor?

I mean, what's your question about it?

RwP
 
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Old Oct 7, 2018 | 03:02 PM
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Depends. Are you concerned about the "LOW OIL" light and the dash gauge, or not?

If you are, put a T in and feed both gauge sensors.

If you're not, don't be concerned ... LOW OIL light is a switch that opens when the pressure goes above 7 PSI, so you can leave that circuit open; the in-dash gauge will just show "0".

RwP
 
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Old Oct 7, 2018 | 07:15 PM
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Thank You RalphP for your helpful suggestions! You led me in the right direction!
Originally Posted by RalphP
Depends. Are you concerned about the "LOW OIL" light and the dash gauge, or not?

If you are, put a T in and feed both gauge sensors.

If you're not, don't be concerned ... LOW OIL light is a switch that opens when the pressure goes above 7 PSI, so you can leave that circuit open; the in-dash gauge will just show "0".

RwP
 
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Old Oct 13, 2018 | 01:37 PM
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Is there an adapter that I can use for the water temp gauge? The Dakota 3.9 use an 1/8 male npt sensor like the one in the attached picture
 
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Old Oct 13, 2018 | 07:45 PM
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I'm sure there is, but without knowing what you are going to, we can't help much.

Is the new one smaller, or larger, than the old one?

If smaller, a bushing should be available at most plumbing supply stores.

If larger ... We gots problems, bossman. The end should be in the water flow; that's kind of hard if you use a larger coupler, an adapter, and a all threads nipple to make it fit.

RwP
 
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