I just bought a used instrument cluster for my '92 Accord off Ebay. Cost $26.59 including shipping and sales tax. I was having 2 minor problems with my cluster: there's an indicator light that tells you if you have a brake light bulb burned out, and it was staying lit all the time, even though all of my brake lights were working fine. I did a bunch of troubleshooting and determined the problem was in the main circuit board of the cluster. The other problem I had was the tach was inaccurate and would sometimes read about 500 rpm too low. Sometimes when idling, it would drop to 0 rpm.
When I received the new (used) cluster, I removed the main circuit board and tach gauge and swapped them over to my original cluster. I also noticed that I had some burned out light bulbs, so I swapped some bulbs from the new cluster too. I reinstalled the cluster and tested all of the gauges and indicator lights, and everything works. Both of the problems I was previously having are now gone. I just need to finish putting the dash back together, and I'll be done.