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tachometer is stuck at 2k

 
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Old 11-12-2014, 02:26 PM
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tachometer is stuck at 2k

so iv been restoring a 89 4ws si and I noticed my tachometer doesnt work it just sits at 2k at all times any ideas on how ot fix this?
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Old 11-12-2014, 03:03 PM
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Re: tachometer is stuck at 2k

Have you revved the engine above the 2k mark and if so does the needle move?
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Old 11-12-2014, 10:39 PM
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Re: tachometer is stuck at 2k

Yep i reved her once she warmed up and nothing. no response its kinda like its dead the fuel speed and temp gauge work
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Old 11-13-2014, 09:41 AM
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Re: tachometer is stuck at 2k

Hey bro . your problem could be the cluster circuit board is solder points are getting undone is due too age , you may have to resolder or replace it .
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Old 11-14-2014, 11:25 AM
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Re: tachometer is stuck at 2k

There are 5 screws that hold the Tach in... 2 fasten it to the back of the cluster and the other 3 are +12V, -12V, and the signal from the coil. Check to make sure they are tight.

The other thing I would suggest is to reseat the connectors on the back of the instrument cluster, which you will inevitably do when you remove and reinstall the cluster. Just make sure none of the contacts on the flexible circuit board are bent over when you take it out.

The circuit board that the screws go into has a few wires coming out of it and go into the front of the Tach. THOSE are the ones you want to reflow the solder on. Aside from them, there really aren't any other connections to resolder, but take a look to see if there are any broken wires.

And if you decide to swap it out for another one, ONLY the 88 & 89 ones will work. the 90 & 91's are different.

One more thing, when the car is off, the needle should rest at 0 RPM, not at 2K. So see if the needle will move easily with your finger. It shouldn't take any pressure at all to move it down to 0 or up from 2K.

Mine was off when I got the car, it was pointing straight down, and all I had to do was hold the back of the needle armature and move the needle to 0.
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1978 Buick Skylark - Sold

"Tackling Those Gremlins One By One"

"If you were as smart as you are dumb, you'd be Einstein!"

"Keep The Shiny Side Up & The Dirty Side Down"

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Old 11-21-2014, 06:03 PM
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Re: tachometer is stuck at 2k

Any luck on getting it to work?
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1989 Honda Prelude Si - Daily Driver (So far, So Good)
1970 Buick GSX Clone - In progress
1988 Chevy Suburban TravelQuest - WorkHorse
1978 Buick Skylark - Sold

"Tackling Those Gremlins One By One"

"If you were as smart as you are dumb, you'd be Einstein!"

"Keep The Shiny Side Up & The Dirty Side Down"
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