Interesting to hear that there is someone who is now retailing the
gears. When I had mine fixed about ten years ago, I used Overseas
Speedometer repair, and they did a great job. They also calibrated the
speedo for me too.
Toll Free: 1-800-444-0292
Voice: 1 512-329-8200
Fax: 1 512-306-0276
Mail: 100 Wallis Drive
Austin, TX 78746
You can also check out Palo Alto Speedometer repair in California, but
ten years ago their prices were higher than Overseas. Just some other
options, and it is a really easy fix.