Innacurate Tachometer
Thread Starter
Racer
Joined: Aug 2002
Posts: 253
Likes: 0
From: Strongsville Ohio
Innacurate Tachometer
I have a 91 that the tach is reading about 3,000 too high. It idles around 3,700 and runs out of numbers if I rev it. Any suggestions will be appreciated.
Thanks,
Gene
Thanks,
Gene
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
The consensus was that if the idle is erratic, it can be the tachometer filter (located near the firewall behind the driver's side cylinder head). However, if there is a consistent high tach reading, it is likely a rebuild of the instrument panel is needed.
Several people offer the rebuild service - Eckler's, Zip, corvettedashclusterservice.com, http://www.tabercorvetteparts.com/parts/clusters.html.
Tachometer filters for the '90 and '91 are no longer available from any major supplier and salvage yards or private sales seem to be the only source.
I also discovered that the '92 and '93 instrument panel is easily swapped into the '91. I read about a forum member that still had trouble even after rebuilding the gauge cluster and changing the tach filter. He ended up getting a '93 and it worked perfectly!
Also, if you use an aftermarket distributor or coil, I've read there can be problems.
-Jonathan
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
