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I have a F250 with 35" tires. The speedometer was never recalibrated and i have a DP tuner chip on the way. Has any of you guys ran a dp tuner or other chip without getting the speedometer corrected or is it something that is really important to do before i install the chip. Thanks for the help guys.
 

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it wont matter at all, unless you want to know how fast your going.
 
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