Tach filter
Le Mans Master
Joined: Jan 2010
Posts: 8,553
Likes: 3
I've read the tach filter is rarely the problem.
After much reshearch, this is what I did.
DISCONNECT NEG BATTERY TERMINAL.
Drop your drvrs hush panel,
drop your steering wheel( 2 bolts)
Remove dash cluster (4 screws)
Remove tach circuit board.
Go to radio shack and buy either 1 200K 1/2 watt ohm resistor, oR two 100K 1/2 watts reistors and solder then together for a total of 200kohms.
Solder this from Pin 4 to pin 10 on the board. The pic shows front, easier to do at back of board. Use shrink tubing or electrical tape as not to short.
Cut, or scratch thru the exsisting path between the "old" route between pins 4 and 10.
Reinstall reversing instructions.
It's really not that hard to do.
Good info here
http://www.thirdgen.org/techboard/el...ter-fix-3.html
Not "my" pic.
It took me quite a while to find this info..good luck.
or, you can send it out for $275-400 and have someone else do it.
Or you can swap a new cluster in.
You'll get with-in 50-75 rpms.
Last edited by Jamesnns; Jul 1, 2010 at 08:45 AM.
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
He has sent you a private message, likely some info on your problem. Look in the upper right area of your computer screen, you should see a small window saying welcome ewdickerson followed by a notice you have a PM. Click on "Your Notifications".
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
90/91 cars have well documented problems with the cluster itself.
New filter seldom fixes problem
http://forums.corvetteforum.com/c4-g...1990-vert.html
http://www.thirdgen.org/techboard/el...meter-fix.html
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
PM sent.
I've read the tach filter is rarely the problem.
After much reshearch, this is what I did.
DISCONNECT NEG BATTERY TERMINAL.
Drop your drvrs hush panel,
drop your steering wheel( 2 bolts)
Remove dash cluster (4 screws)
Remove tach circuit board.
Go to radio shack and buy either 1 200K 1/2 watt ohm resistor, oR two 100K 1/2 watts reistors and solder then together for a total of 200kohms.
Solder this from Pin 4 to pin 10 on the board. The pic shows front, easier to do at back of board. Use shrink tubing or electrical tape as not to short.
Cut, or scratch thru the exsisting path between the "old" route between pins 4 and 10.
Reinstall reversing instructions.
It's really not that hard to do.
Good info here
http://www.thirdgen.org/techboard/el...ter-fix-3.html
Not "my" pic.
It took me quite a while to find this info..good luck.
or, you can send it out for $275-400 and have someone else do it.
Or you can swap a new cluster in.
You'll get with-in 50-75 rpms.
I've read the tach filter is rarely the problem.
After much reshearch, this is what I did.
DISCONNECT NEG BATTERY TERMINAL.
Drop your drvrs hush panel,
drop your steering wheel( 2 bolts)
Remove dash cluster (4 screws)
Remove tach circuit board.
Go to radio shack and buy either 1 200K 1/2 watt ohm resistor, oR two 100K 1/2 watts reistors and solder then together for a total of 200kohms.
Solder this from Pin 4 to pin 10 on the board. The pic shows front, easier to do at back of board. Use shrink tubing or electrical tape as not to short.
Cut, or scratch thru the exsisting path between the "old" route between pins 4 and 10.
Reinstall reversing instructions.
It's really not that hard to do.
Good info here
http://www.thirdgen.org/techboard/el...ter-fix-3.html
Not "my" pic.
It took me quite a while to find this info..good luck.
or, you can send it out for $275-400 and have someone else do it.
Or you can swap a new cluster in.
You'll get with-in 50-75 rpms.
Race Director
Joined: Oct 2002
Posts: 13,717
Likes: 5
From: RI
SERIES connection looks like (WHAT YOU DO WANT TO DO IF YOU BUY THE TWO 100K RESISTORS):
PARALLEL connection looks like (WHAT YOU DON'T WANT TO DO)"
