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Hello guys,

I enjoy coming here to read all the information about my 05 F250 6.0. I’ve had a problem with my speedometer being 5 MPH faster then what I’m really going. I have a gps speedometer in my navigation radio, my cell and the road signs to confirm. The question I have is how do I dial it into my truck? The previous owner took the 20” rims from a 2015 and the tire size is 275/65/20. I’ve taken it to the Ford dealer 2 times and the auto tire size 275/65/20 is still 5 MPH off. I talked to the guy last time and there is a place to put it in manually. I just want to make sure if this is what it’s suppose to be before I try again. Does this photo of the calculator look correct? Tia!
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