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if you keep your old speedometer your real mileage reading will show your real mlieage of your car but may be off a little. now with your new speedometer will show the mileage out of the car you got it from. lets say yuor old one was 123000 and the new one is 86000. when i changed mine so i had a tack, i put my old speedometer into it so i know that the car really had on it and im up to 296000 plus.
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