Are you sure your odometer is also off? If only the speed indication is off a bit, it may be possible to make a slight adjustment. If both your speed AND mileage are off, you'll need a different gear, or to figure out where the error might originate - rear end or tire-size.
I have a prob;em with my stickshift 240D speedometer. Both the speedometer and odometer read about 10% slow. The speedometer was mistakenly replaced by the PO when it really only needed a new cable. Of course the original speedometer was disposed of beefore I bought the car.
And in the case of my Euro 300TD, The speedometer and odometer reads about 15% too fast. I suspect that my original KMPH speedometer was replaced with a USA-spec MPH turbo-diesel speedometer - compatible with a 3.07 or 2.85 rear end, but not with my non-turbo wagon with it's a 3.47 axle ratio.
Happy Motoring, Mark
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DrDKW
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