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90-92 Tachometer fix....

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Old 09-08-2016, 08:15 PM   #501
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Re: 90-92 Tachometer fix....

Battery dead?
Maybe left ignition on, doors open a couple days, etc?
You got battery voltage and grounds on the IP connectors but can't really see them getting together to drain your battery or causing any other problems.
If nothing that obvious, may be better to start a new thread in Tech/General engine forum.
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Old 09-08-2016, 08:19 PM   #502
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Re: 90-92 Tachometer fix....

Battery dead was my first thought. After charging for a few hours, I still get nothing.

I'll post something in the general tech forum but let me know if any of y'all think of something else...
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Old 09-08-2016, 09:13 PM   #503
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Re: 90-92 Tachometer fix....

I'm in the same boat as you although it's not nearly as bad. I took mine out to fix the tacho last summer and when I put it back the speedo stopped working.

The best I can tell is the membrane on the back of these clusters is super fragile. You may have a trace that has come loose. Gluing them back in place might solve it or perhaps soldering any broken points.

Also it might be an issue with the security chip on your key/ignition. Last month the repro set of keys for my car stopped starting it. When I used the original set it started right up, so I guess the resistor inside the key went bad.
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Old 09-09-2016, 09:13 AM   #504
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Re: 90-92 Tachometer fix....

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Originally Posted by HowardC View Post
I'm in the same boat as you although it's not nearly as bad. I took mine out to fix the tacho last summer and when I put it back the speedo stopped working.

The best I can tell is the membrane on the back of these clusters is super fragile. You may have a trace that has come loose. Gluing them back in place might solve it or perhaps soldering any broken points.

Also it might be an issue with the security chip on your key/ignition. Last month the repro set of keys for my car stopped starting it. When I used the original set it started right up, so I guess the resistor inside the key went bad.
Is there a way to test if the key is bad? It's still the stock key so it's possible.

Also, would the film on the back cause me to lose all power from it coming loose? I could see losing power to the cluster but not the entire car.
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Old 09-09-2016, 03:34 PM   #505
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Re: 90-92 Tachometer fix....

Yeah use a multimeter on either side of the chip in the key. It should read 100-1000 ohms.

If it's shorted I suppose it could blow your fuses. You need to check them all. Honestly the whole car dying on you could be unrelated.

No power anywhere? Like not even the hood light or the courtesy lights?
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Old 09-09-2016, 03:52 PM   #506
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Re: 90-92 Tachometer fix....

I will check the key tonight and check all the fuses.

There is no power anywhere. Its as if there is no battery in the car. But I promise there is...
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Old 09-10-2016, 01:08 PM   #507
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Re: 90-92 Tachometer fix....

Key is reading just over 1k ohms. All the fuses are good.

Checked all the grounds off the battery too. All were clean and very snug. Battery also registering just under 12 volts when on the multimeter.
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Old 09-17-2016, 05:09 PM   #508
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Re: 90-92 Tachometer fix....

fixed my 91 z/28 tach, was pinned and now it works

Last edited by Roblen91GTA; 09-18-2016 at 06:48 PM. Reason: fixed
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Old 04-18-2017, 07:13 AM   #509
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Re: 90-92 Tachometer fix....

What do you do when all the Radio Shacks are gone?

Anyone have a part number or code for the resistors?
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Old 04-18-2017, 09:27 AM   #510
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Re: 90-92 Tachometer fix....

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Originally Posted by PurelyPMD View Post
What do you do when all the Radio Shacks are gone?

Anyone have a part number or code for the resistors?
Just type in the ohm reading you want, 1/4W should be plenty but 1/2 watt will work fine if you want to try to fit in in. Any of these places will have it. You can even get them prime

https://www.digikey.com/
www.amazon.com
www.ebay.com
www.mouser.com
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Old 04-18-2017, 08:39 PM   #511
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Re: 90-92 Tachometer fix....

Is anyone here repairing the boards as a business? I suspect mine is reading high - would prefer not to dive into a project I'm not comfortable with.
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Old 06-23-2017, 06:06 PM   #512
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Re: 90-92 Tachometer fix....

I see a 1990-92 Camaro tachometer replacement circuit board is now available. Finally!
http://www.wc-autoparts.com/new-1990...circuit-board/
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Old 07-08-2017, 11:30 PM   #513
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Re: 90-92 Tachometer fix....

My tach read way too high. I bought a new board from GC280 and installed it today. It works great now.
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Old 07-08-2017, 11:50 PM   #514
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Re: 90-92 Tachometer fix....

Quote:
Originally Posted by JdubRS View Post
I bought a new board from GC280...
who is GC280?

Last edited by RPOL98; 07-09-2017 at 04:31 AM.
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Old 07-09-2017, 12:41 AM   #515
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Re: 90-92 Tachometer fix....

Oops. I meant GCJ280. He's a member. http://m.ebay.com/itm/142422813673.
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Old 07-09-2017, 04:30 AM   #516
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Re: 90-92 Tachometer fix....

wow, that looks like the same part sold by WC AutoParts for $90.
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Old 07-09-2017, 01:19 PM   #517
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Re: 90-92 Tachometer fix....

Totally. I bought resistors and a potentiometer and was going to fix mine, but then I saw the new one. There's no point in messing with it.
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Old 08-10-2017, 03:58 PM   #518
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Re: 90-92 Tachometer fix....

Differences between V6 & V8 are one thing.
But also the signal scaling will be different on the 90-92 tach's -vs- the 89 and older tachs, since the 90-92 tachs sweep only 180 degress of movement for full range and the 89 and older tachs sweep a full 270 degrees.


I was looking into this since I have to retune my 89 V8 tach and have noticed that has been drifting up over the last couple of years.


Reads about 150% high. Resistor drying out, but not completely open yet...?
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