presume you are paying for each kilometer travelled?
In the uk and I presume elsewhere, the speedo's are allowed a +10% and -0% tolerence, ie allowed to read overspeed but not under. in practice most speedos read over by about 10%.
work out the revs/km in top, then use the rev counter for a while as a speedo whilst the speedo drive is disconnected. if it is all digital then you're up the creek.
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Harley Davidsons,
The most effective way of turning petrol into noise without the side-effect of horsepower
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