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Remember, the +5% / -0% is a manufacturing tolerance and each car will be somewhere within that range.
A 1mph 'factory' error would beat even that of a certified & calibrated instrument. 5% of the full scale is good for any mechanical gauge, so there is really no problem.
There'll be worse accuracy for sure on your fuel gauge, temperature gauge, oil pressure gauge, cabin temp settings, battery voltage gauge, MPG guage, wash/wipe warning light, oil pressure switch,
There all gonna be crap accuracy, which is OK for the job in hand.
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