Topic: tach problem
in Forum: All Vettes Discussion
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The tach on my 1990 is out in left field. Everything in the dash cluster works fine except the rpm reading of the tach,I have put a tach on the distributer and it is at 850 rpm but the the tach in the dash is at 2500 rpm. I think it needs to be calibrated. Does anyone know where I could send the cluster to have this problem fixed. Thanks for your help. Greg.
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Talk to the folks at Bair's. They deal with a independent contractor that does tach repair for our C3s. He may be able to help you.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
You may need to replace the tach filter, located in line, close the the distributor. It will be on the white wire coming off of the distributor. They go bad quite often, and create erratic tach readings. 
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
In that case, your will probably need to send the cluster out for repairs...
I have the info for a guy that does it really cheap(compared to other places), I sent the dash for my '85 to him, and it never worked as well before he fixed it! If you would like the info, shoot me a P/M. Adams' Apple 2007-06-14 20:20:29
I have the info for a guy that does it really cheap(compared to other places), I sent the dash for my '85 to him, and it never worked as well before he fixed it! If you would like the info, shoot me a P/M. Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Is your vette a 1990 or a c3, there is a small circuit board behind the tach
that goes bad, you may want to change it
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
[QUOTE=gsfowler ]The tach on my 1990 is out in left field[/QUOTE]
These cars do not have the flexible printed circuit board like the Shark cars do. The dash cluster is pretty much all one piece of electronic mayhem!!
These cars do not have the flexible printed circuit board like the Shark cars do. The dash cluster is pretty much all one piece of electronic mayhem!!
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: All Vettes Discussion
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