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I don't think there's a kit available, and I wouldn't mess with it.
There is a very good guy in Palm Beach Gardens who specializes in all Corvette gauges. I can't remember the name of the company right now, but he's the best.
If you inquire someone in my 'Vette club, I know you will find him.
Usually the little nylon gear strips. I don't know if there's a kit either. I'd take the speedo out and have it gone through. One more thing...make sure that the trip odo cable is disengaged. Sometimes that will foul things up. Chuck