It's usually one of the cogs. I got a replacement from the US -- https://www.240turbo.com/240-odometer-repair.html
It's not a challenging job -- just follow the instructions that come with it.
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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