I had the same problem with mine, but my gears were ok. The physical button that you push is on a minature post that pushes on a lever (like a teeter-toter) and when the lever is pushed, it releases a spring catch and all the digits 'zip back' the the springs neutral position (000.0). On my car, the thin post had broken, thus the main button could be pulled right out of the instrument cluster without removing it from behind.
Due to the NUMEROUS failues involved with the odometer (a friend borrows your car, resets it when driving and breaks the gear, etc) I would opt to remove the switch rather than repair it. I removed all the button hardware and unclipped the teeter-toter lever too (so it doesn't rattle around back there). Before I reinstalled the cluster, I cut a square piece of neoprene (flexible rubber/plastic material) to size, made an circular incision around the middle of the edge and inserted it into the hole in the plexiglass window. It looks perfect!
I would also advise performing this operation when the car's odometer is exactly at one of the 1,000 mile marks. Some day when you're really close and you have the car at home, jack up the rear wheels and run the engine lightly until you're at one of the 1,000 mile marks, stop and remove the instrument cluster and perform the operation above. If you reset the trip odometer in the process, it will scroll the same digits as the main odometer, and now you have a decimal point too! (to help with calculating fuel mileage if you're into that degree of accuracy)
Good luck and God bless,
Fitz Fitzgerald.
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'87 Blue 245, NA 214K
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