instrument cluster
Thread Starter
Heel & Toe
Joined: Apr 2006
Posts: 19
Likes: 0
From: CLERMONT FL
instrument cluster
HELP !!! I just joined the Corvette ranks and I'm already lovin it. I got me an 84 with a 96 motor and I'm ready to get busy. My problem is the instrument panel, all the lights work and the gauges work except the tach and speedometer, also the writing on the fuse panel is faded so I,m looking for a diagram. Any help would be greatly appreciated
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
The cluster has 4 lamps that back illuminate the instruments. If the lamps near the speedo and tach are not lit, then it appears they are not working. If all 4 lamps are lit, and the speedo/tach are not working then you need to determine if the cluster is getting signals from the speedo sender in the transmission and the tach signals from the distributor. If not, then the cluster circuit boards will need to be repaired. A schematic (but not for an 84) and other info on the cluster is available from www.batee.com
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
I'm gonna throw in my 2 cents on this one. Sounds like this could be a wiring nightmare once you get into it. It may be wise to buy two fsm manuals, one for each year. So we know the ecm was changed, how did they incorporate the dash wiring? My next question is, is the 84 and 96 fuse block the same or different?
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Team Owner
Joined: Feb 2006
Posts: 24,460
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From: sw Ohio
The fuse blocks are different. If you've looked at both, you'd see that the newer one has a LOT more fuses in it. Also possible for the amp ratings to be different on fuses that would be found in both years.
Drifting
Joined: May 1999
Posts: 1,478
Likes: 3
From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
I agree with qws. Since you have a 96 Engine in an 84, my guess is that the 96 ECM was used in place of the 84 ECM. I'll bet that the significantly differences with regards to inputs to the digital readout for the 96 versus that of the 84 is the root of your problem.
Since the 84 cluster LEDs light up, I'd guess that the person who installed the 96 ECM did not correctly connect the 84 digital cluster inputs for the tach and speedo to the 84 cluster. You need the wiring diagrams for the ECM and digital readouts for both the 84 and the 96.
Since the 84 cluster LEDs light up, I'd guess that the person who installed the 96 ECM did not correctly connect the 84 digital cluster inputs for the tach and speedo to the 84 cluster. You need the wiring diagrams for the ECM and digital readouts for both the 84 and the 96.
