I just bought my 91 rs 4'months ago never thought bought it bc I know where to shift. Now, it's starting to annoy me.... When at idle, my tach reads between 2500-3000 rpms and thee car is probably running 500-800 rpms, idk what normal is. Would this be a busted tach, bad wire, fuse? What could fix this? Any help would be great, thanks

 

From what ive read a lot of peoples tachs are off and i dont think its an easy fix from what i read, mine sits at the redline all the time, i just got a autometer tach im gonna use instead. Do a search in the electronics section i believe

 

I have the same problem in my 89 rs.I just figured something wasn't hooked up properly when the previous owner swapped an l05 in or he replaced the tach with one out a v6 car.

 

An aftermarket tach such as autometer would be a good alternative and are more accurate then the stock tach. I had the same problem with my original tach and a swapped out the entire guage cluster for a working one and put in an autometer tach as well.

 

a common problem with 90-92 camaros . (mine has it) there are fixes , try a search for the problem (90-92 tach fix) . i just live with mine , i'm a cruiser , not a racer . good luck .

 

all the third gen tachs go bad.i have a two"tach and unplugged the dash tach.there are people on tgo that have posted repair solutions but its over my head.

 

I found the article, it's located in the electronics section, it's a simple fix.... Read it. I haven't tried it yet, I will very soon though.... It's between two pins on your tach board. I believe it's 4 and 10, it has pics if you don't understand. Clip 4&10 and solder an in series of @197k ohms from pins 4 to 10... Should fix prob... That's a brief, but read the article.

 

Yeah im more of a mechanical type, i can do basic wiring but whe it comes to that kind of stuff i dont even bother. If i had the right tools like a multimeter and sodering gun i could probley figure it out. But when i bought my car there was an autometer tach in the back seat so i'll just use that lol

 

its very simple, solder between the two pins a resistor u can buy at radio shack. just look up the thread as this has been discussed and has very clear pictures tells u the pins and the resistor needed. its simpler than how it sounds believe me!

 

Do a forum search for tachometer fix. They have a thread on here with a full tutorial on fixing your tach. These guys posting above me have the right fix, but the thread goes into detail and has really helpful pictures to help you along. I used it to fix my tach that was off by several thousand rpms like yours.

 

I did that but eventually ended up buying another tach. What I ended up with was a tach which worked great showing the idle rpm's up until 1500 and then it was way off.

When I first started fixing it, my idle was at "1500" per the original tach and at 1500 (external meter) my tach showed 5000

If you want accuracy, buy an aftermarket tach

 

its a little harder on a 1989.the circuit board is fastened to the tach.i went ahead and ordered the capacitor that moreley?suggested and will try replacing that.it was only nine dollars with shipping.

 

Excellent, i can finally have a decent working tachometer. I don't care if it's perfectly accurate. I just don't want a goofy racing tach.

And on a side note... Why is it that when people step into a thirdgen for the first time they think the tach is the speedometer... "Ohh it only goes up to 70?"

 

There is now a replacement for the 1982-89 Chevy Camaro V8 Tachometer Circuit Board. Any body try this yet.
https://www.wc-autoparts.com/1982-89...t-replacement/

 

Heres a thread on a guy who fixes them and/or sells the board cheaper.
https://www.thirdgen.org/forums/elec...-tach-fix.html

 

It's funnier when they think you're going 70 on a slow road