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Author Topic: Problem Solved:: Gauge issues  (Read 10215 times)

Offline 19kflo80

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Problem Solved:: Gauge issues
« on: January 02, 2015, 07:33:16 PM »
1984 CUCV, 350tbi(swapped 6.2), th400. Like many post I've come across, i too am having oil pressure gauge problems. My issue is that my OPG is pegged all the way to the right any time i turn the key on running or not. From what i read, this is likely an open circuit. However, i have good continuity from my tan SU wire to the cluster and 0.5ohm short to grd from cluster to grd block on parking brake. I swapped OPG from another cluster and same result.  This is about the extent of my testing capabilities. I would really like to keep the factory gauges, but at this point i am considering a cheap set of mechanical gauges. Any help would be appreciated.
« Last Edit: January 07, 2015, 10:50:33 PM by Irish_Alley »
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline LTZ C20

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Re: Gauge issues
« Reply #1 on: January 02, 2015, 07:45:09 PM »
Which type of engine do you have in the truck, tbi 350 or 6.2 diesel? just want to be double sure.

Have you checked your oil pressure sensor for proper operation?
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Offline 19kflo80

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Re: Gauge issues
« Reply #2 on: January 02, 2015, 07:57:19 PM »
350tbi. I checked the SU(i think), i checked where the tan wire plugs in on SU to ground and it and it was open.
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline 19kflo80

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Re: Gauge issues
« Reply #3 on: January 02, 2015, 08:00:15 PM »
Also, on the back of the cluster(while engine running) i have 14vdc on one side of the gauge and 10vdc on the other side. Is that normal?
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline Dr_Snooz

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Re: Gauge issues
« Reply #4 on: January 02, 2015, 09:17:52 PM »
Without consulting the wiring diagrams, that sounds like a dead short to ground through the pressure sender. It's not uncommon for them to go out.
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Offline LTZ C20

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Re: Gauge issues
« Reply #5 on: January 02, 2015, 09:47:31 PM »
Like the Dr. said, the pressure sending units have a tendency to go out or leak, mine did both, after replacing it about 3 times, I finally got an adapter fitting and used the sending unit from 90s tbi engine, also got the appropriate harness to plug into it, being those sensors in the 90s where weather pack connectors not the older style spade connectors.
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Offline Irish_Alley

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Re: Gauge issues
« Reply #6 on: January 02, 2015, 11:54:11 PM »
what ops are you using?
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Offline 19kflo80

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Re: Gauge issues
« Reply #7 on: January 02, 2015, 11:58:56 PM »
By the filter
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline Irish_Alley

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Re: Gauge issues
« Reply #8 on: January 03, 2015, 12:02:08 AM »
no, i mean which sender for what engine
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Offline 19kflo80

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Re: Gauge issues
« Reply #9 on: January 03, 2015, 01:57:50 PM »
The sender that was on my tbi
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline Irish_Alley

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Re: Gauge issues
« Reply #10 on: January 03, 2015, 04:02:42 PM »
What's the one on the TBI look like?
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Offline Irish_Alley

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Re: Gauge issues
« Reply #11 on: January 03, 2015, 05:19:36 PM »
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Offline 19kflo80

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Re: Gauge issues
« Reply #12 on: January 03, 2015, 10:25:45 PM »
I got the 60psi( stamped on the sender). Would a bad sender cause the needle to peg far right? Or just an open ground? Temp gauge works though, so im thinking ground is good.
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1984 CUCV, 350tbi, th400, NP208, dana 60, 14bolt FF, 6" springs front, shackle flip rear, 38.5x15/ 16.5 Boggers

Offline Irish_Alley

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Re: Gauge issues
« Reply #13 on: January 04, 2015, 12:31:25 AM »
unhook it and see what it does, then ground the plug out
« Last Edit: January 04, 2015, 12:41:00 AM by Irish_Alley »
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Offline Irish_Alley

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Re: Gauge issues
« Reply #14 on: January 04, 2015, 12:32:21 AM »
i just dont know if you can mix senders of certain years to gauges of others. maybe bd can chime in
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When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
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