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Discussion Starter #1
I have this installed on my 08 F350.....A little confused as to the Tire Size Calibration. I put in the new tire size 38x14.50R20 and the old tire size of P265s and it supposedly re calibrated my speedometer. However, I am still 5-6 mph off at 60 MPH according to the local police that have tailed me and radared me. Does anyone know how accurate this is? Thanks
 

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Discussion Starter #3
That is what I thought.....but I put in the old tire size and the new tire size like it calls for and it still displays the exact mph reading as the speedometer on the vehicle????
 
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