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Gauge cluster wiring

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Old Jun 30, 2025 | 09:21 PM
  #1  
camarorsssss's Avatar
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Car: 1991 camaro rs convertible
Engine: Built ls1
Transmission: T56
Axle/Gears: 3:42
Gauge cluster wiring

Working on tracking down why my fuel gauge isnt working, pegged fuel which means there is nothing connect to the gauge itself. I traced wires, all are good at the bulk head and the fuel sending unit. Figured it is probably something with the gauge or wiring behind the gauges at this point. Took the cluster out of the car and checked connected at the two connected behind the cluster. This is what doesnt make sense to me, after checking the pin outs for 90-92 camaro, which is what this car is 1990 tbi camaro, I see that the fuel gauge should be a PPL wire on the drivers side in spot #4. Well, there is nothing there. Based on the pinouts I have found, it says that 9-11 are unused ports on the connecter. But on my connecter, spots 2-4 are empty, while 9-11 have wires going to them. My oil pressure gauge works, which is supposed to be in spot 3, but i think is plugged into one of the other ports. I have added 2 photos of the drivers side connector. Am I missing something?



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Old Jul 1, 2025 | 09:04 PM
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camarorsssss's Avatar
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From: LONG ISLAND, NY
Car: 1991 camaro rs convertible
Engine: Built ls1
Transmission: T56
Axle/Gears: 3:42
Re: Gauge cluster wiring

Doesn't make much sense, but I disconnected the fuel gauge wire from 11 and put it in 4, where it theoretically belongs, no dice. I put it back into 11, made sure it was secure and bowed up like the rest of them, hooked the gauge cluster back up and well, now the fuel gauge works. Weird that the diagrams I have seen suggest one thing but my connecter is wired differently and works correctly.
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Old Jul 1, 2025 | 09:48 PM
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Car: 91 Trans Am
Re: Gauge cluster wiring

Looks like it's supposed to be in #11

https://charm.li/Chevrolet/1991/Cama...20Speedometer/

Possible it had a bad connection and the cluster R&R re-seated it enough. Honestly, the entire system is dubious at this age. Bad gauge, bad connection, bad wiring, bad pass through behind the rear seat, bad sender
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Old Jul 2, 2025 | 05:41 AM
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camarorsssss's Avatar
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Engine: Built ls1
Transmission: T56
Axle/Gears: 3:42
Re: Gauge cluster wiring





Ok, so I was going off of this wiring diagram I got off of austin thirdgen. Is this wrong?
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Old Jul 2, 2025 | 07:13 AM
  #5  
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: Gauge cluster wiring

Originally Posted by camarorsssss




Ok, so I was going off of this wiring diagram I got off of austin thirdgen. Is this wrong?
It should be correct. I used this exact chart for my aftermarket gage cluster conversion and everything worked out well.
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Old Jul 4, 2025 | 12:36 AM
  #6  
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From: Armstrong B.C.
Car: 1991 camaro Z28
Engine: Forged 370" LS turbo s488
Transmission: Built 4L80e FTI converter
Axle/Gears: MWC 9" 35 spline 3.25 gears
Re: Gauge cluster wiring

Originally Posted by ShiftyCapone
It should be correct. I used this exact chart for my aftermarket gage cluster conversion and everything worked out well.
That's the same one I used for my Autometer cluster
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Old Jul 4, 2025 | 06:38 AM
  #7  
camarorsssss's Avatar
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From: LONG ISLAND, NY
Car: 1991 camaro rs convertible
Engine: Built ls1
Transmission: T56
Axle/Gears: 3:42
Re: Gauge cluster wiring

Its weird that in that diagram is shows fuel gauge being in the #4 slot on C2 but in the actually wiring schematics posted by Pocket, it shows C11, which is actually what I have and to be correct.
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Old Jul 4, 2025 | 10:07 AM
  #8  
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Car: 91 Trans Am
Re: Gauge cluster wiring

I really don't know. Figured it may be early vs late camaro gauges, but the C1/C2 is wrong too
Compared to 88/92 birds and still couldn't find anything matching that pinout

Here's an 88 camaro. Fuel gauge is C1 pin 4

https://charm.li/Chevrolet/1988/Cama...ges%20Cluster/

91 Camaro Fuel is C2 pin 11

https://charm.li/Chevrolet/1991/Cama...20Speedometer/

88 bird Fuel is C2 pin 10

https://charm.li/Pontiac/1988/Firebi.../Fuel%20Gauge/

92 bird, Fuel is C2 pin 10

https://charm.li/Pontiac/1992/Firebi...ometer%20Head/
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Old Jul 4, 2025 | 10:59 AM
  #9  
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From: LONG ISLAND, NY
Car: 1991 camaro rs convertible
Engine: Built ls1
Transmission: T56
Axle/Gears: 3:42
Re: Gauge cluster wiring

yeah, I do not think that diagram is correct. None of the wiring diagrams I have seen match up to that one
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