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Old 09-09-2020, 08:18 PM   #2
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bobxyz's Avatar
Join Date: Aug 2014
Location: Boulder CO

I forget the exact details, but the old cable driven speedo's spin a magnet near a metal cup (or vice-versa?) to deflect the needle. Going backwards won't hurt anything (same as backing up the car). Over time, the magnet loses some magnetic force and the speedo reads low. You could try to find a vintage speedo shop to re-magnitize the speedo, or you might be able to find a different transmission speedo gear that spins a bit faster.

If you spin the speedo by hand, in the right direction, you can eventually get the odometer to move a bit. Or use a drill with a piece of plastic coated house electrical wire to spin it faster.
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