My 200S has a mechanical drive for the speedometer but does the needle sweep speedometer test when you turn on.
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Yes, mine does the sweep also so there is something electrical in there along with the cable drive.
The last few times I started Scarlette, the sweep returning toward "0", may go all the way to "0" or it may stop at "10" or "25" kph. Kind of random reset.
Maybe a critter living in the meter?