You have a MS462 C with m-tronic? M-tronic has a 2nd pair of poles on the flywheel to power the m-tronic system. It`s possible that this confuses your tach.
After taking the cover off and holding it right above the spark plug it looks like around 12500
It's still pretty speratic
I don't know if I trust it
It's the non mtronic adjustable carb model
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