If the gear replacement doesn’t fix your problem and you’re at your wits end, contact Mark Olson of Accutach Company (408)357-3541. He reworked my ‘95 cluster for a VERY reasonable price.
He’s in San Jose, CA. Works out of his house on the clusters, and is an electrical engineer. Mine came back like Day 1 new, everything in proper working order and a print out with explanations of all measurements and corrections made. He turned mine around in a matter of days and packaged great. Can’t say enough good about him and his work.