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Topic: tach problem

in Forum: All Vettes Discussion


tach problem

Posted: 6/9/07 6:07am Message 1 of 9
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N. Scituate, RI - USA
Joined: 2/24/2006
Posts: 30
Vette(s): 1971 roadster 4 speed blue with white top 1990 roadster 6 speed white on black
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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tach problem

Posted: 6/9/07 7:55pm Message 2 of 9
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
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.


tach problem

Posted: 6/13/07 6:13pm Message 3 of 9
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N. Scituate, RI - USA
Joined: 2/24/2006
Posts: 30
Vette(s): 1971 roadster 4 speed blue with white top 1990 roadster 6 speed white on black
I called bair's but with on luck,thanks for trying.  greg


tach problem

Posted: 6/13/07 7:48pm Message 4 of 9
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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
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tach problem

Posted: 6/14/07 1:32pm Message 5 of 9
Former Member
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N. Scituate, RI - USA
Joined: 2/24/2006
Posts: 30
Vette(s): 1971 roadster 4 speed blue with white top 1990 roadster 6 speed white on black
I tryed replacing the tach filter with no change and I tried hooking it up without the filter ,no change. greg


tach problem

Posted: 6/14/07 8:19pm Message 6 of 9
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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
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' Apple2007-06-14 20:20:29


Joel Adams
C3VR Lifetime Member #56    

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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

tach problem

Posted: 6/15/07 8:05am Message 7 of 9
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Suffern, NY - USA
Joined: 3/16/2005
Posts: 227
Vette(s): 1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system
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



tach problem

Posted: 6/15/07 10:35am Message 8 of 9
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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
[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!!


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"

tach problem

Posted: 6/18/07 1:54pm Message 9 of 9
Former Member
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N. Scituate, RI - USA
Joined: 2/24/2006
Posts: 30
Vette(s): 1971 roadster 4 speed blue with white top 1990 roadster 6 speed white on black
I've tried everything people have suggested so far with no luck.  Does anyone have any other resources or ideas? Thanks. Greg.


in Forum: All Vettes Discussion


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