I used to fix speedos for a living for about 5 years, working in my Dad's shop who has been doing it for the last 20.
In my experience people who do this stuff at home screw it up, a lot. On a daily basis I would have to fix something that some idiot had broken whilst trying to repair, modify or rewind a speedo.
Fixing and modifying instruments needs good skills and a pedantic attitude. Most people don't have either.
So forgive me if I doubt your ability to swap the odometers over and still have a working, accurate and cosmetically un-damaged speedo. The odds, in my opinion, are right up there with the odds of me performing successful dental surgery on myself.
That’s why I recommended you take it to a qualified repair shop.
If you have done it all successfully and have managed to re-calibrate the speedo after dismantling it, then good work!
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