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Wow, I have a lot of work to do on this car! My stock LED tach is not working. Its always lit up, and a few of the lights are out. When i turn the headlights on it goes out. SO does the boost gauge.

The gas gauge is also way off??
 

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There is a parking light input as well as a dimmer input to those gauges.

Brown and gray wires.

Make sure the rheostate and INST LPS fuses work for the dash lights.

Make sure the parking lamps work also.

Lots to check out on that car. :(

Fuel sender is another story in itself.
 

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If you have your lights turned on, but the dash light dimmer cranked all the way, your tach/boost will not light up.

Yeah, I thought I had a major problem with that once. Turned out to be that simple in my case. loser

It does sound like you have some bad led segments in there, though, from your description.
 

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Oh yeah, mine has a very unpredictable fuel gauge too. Got to the point that I would just watch the trip odometer and gas it up when I got so far miles-wise. Probably could spend some time trying to fix that, but...
 
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