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My answer is maybe, and probably not. At least mechanical speedos (with a cable) have a direct connection to the odometer (fixed gearing) and a magnetic drive for the needle.
I've never been in a electronic speedo, but I'd guess that the needle is driven a similar way and can have variations over time (electromagnet with a spring?). The odometer, on the other hand, is most likely still direct drive.
Best way to figure it out is just compare highway markers... or take it apart and see how it works! 10% is a lot, you should be able to figure it out.
Jaime
'88 Targa
and some mercedes, with old speedos.
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