2G 2g Electrical issue. Some dash gauges not working

rbeccari56 · Jun 28, 2026

I own an early 95 GSX auto that I have been slowly working on for the last 21 years. It's ready to drive but I am currently experiencing a gauge issue. The tach, speedometer and the fuel gauge aren't responding. I already replaced the cluster with no results. I tried 5 different power units, with no change for the tach.

I upgraded the fuel pump wiring, pulled the fuel pump assemblies (both sides) cleaned all the contacts with no results. Also removed the speedo harness at the tranny, cleaned the contacts also with no results.

The thing is that several years ago, everything was working fine. Searched the forums, but never really found anything related to this. I'm running ECMLink V3. Is there maybe a setting that can turn these gauges on or off? I'm at a loss. There is no common thing except for the cluster (which I already replaced once with the exact same results) I don't remember changing any one thing between when everything worked to now.

Any clue, hint or suggestion will be highly appreciated. Thank you for any assistance.

steve · Jun 28, 2026

What exactly have you checked or are you just swapping parts?
Do the various lights in the cluster work? The are powered from the taillight relay.

Most of the gauges are powered from the 10A fuse #8 in the Junction Box. It gets power from the ignition Switch IG1 circuit. The Brake, Oil, and Fuel warning lights also get power from the same fuse.

The ground connection is shared by the gauges and the ODB2 connector, it's ground #5. The warning lights use various grounds that are connected to the sensors for the lights.

rbeccari56 · Jun 29, 2026

Thanks for the input. Forgot to say that the fuse is fine and all other gauges and light are working. So it's just the 3 specific ones that are not. I've been chasing this issue down now for over a year, with no luck. Never tested the taillight relay, so thats up next.

steve · Jun 29, 2026

As mentioned the taillight relay is only powering the cluster lighting. If it lights up when you turn on the headlights that part is fine.

I'll look again to see if there is anything only tied to those three gauges when I get home.

luv2rallye · Jun 29, 2026

Does your rheostat (dash light intensity) also not work?
According to my 1999 wiring diagrams, the common thing between all those things you mention (and rheostat) is the grounding which goes through the junction block connectors B-66 pin 2, B-49 pin 1, to the chassis ground point #5 (under dash left of center duct - pic is unclear but may be behind instrument cluster).

rbeccari56 · Jun 30, 2026

Thanks for the reply. I'll check that next and see where it goes from there. Will advise with results once I can get around to it. Just had surgery, so it will be a few days.

rbeccari56 · Jul 1, 2026

I just checked the rheostat and it works fine, so probably not the ground. So you are saying that the tach, speedo and fuel gauge are all linked together. I have the 96 service manual for the Talon so I'll try to find a common point. Electrical wiring is not my forte. Thanks again.

steve · Jul 1, 2026

This is what I was looking at to start with. I checked my 95 Talon FSM and it doesn't look very different. The power for all the gauges is shown on PG204 where is comes from the fuse #8 and into the cluster on pin 10 of C-06.

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rbeccari56 · Jul 1, 2026

Yes, that's the same diagram I have. I can trace the wires, but I get lost translating it to the actual car. Where in the car would I find "comes from the fuse #8 and into the cluster on pin 10 of C-06" Do I have to remove the cluster again to find C-06? Where in the manual does it show what these connections look like? Really sorry for all the questions. I can build a mean motor, but get lost when I get to electrical.

steve · Jul 1, 2026

The location of C-06 is the easy part. Identifying pin 10 is a bit more involved due to the diagram convention of how connectors are shown and the differing numbering on the cluster itself. Thankfully pin 10 is on an end so it's easier to hunt the right corner with a multimeter.

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Fuse 8 is in the Junction Box in the driver's footwell under this cover.

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rbeccari56 · Jul 2, 2026

Thanks, that helps. I actually have the manual that shows this, from years ago, but forgot. Sucks getting old.

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2G 2g Electrical issue. Some dash gauges not working

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