MillsMotorvation

Inncorrect MPH, just purchased HP Pro, and my MPH is off. I have a LQ4 swap into a 1981 TA, TH350 trans, and 3.08 gear. Also the VSS is a Dakota Dig with 8000 pluse per mile. The scanner is showing 5,760 per mile VSS. Do I just change the 5,760 to 8,000? I already tried to make my MAP read Boost, and its not reading right I think, what can I do to change MAP back to what it was. It has a spped density tune by frost, I just want it to read correct mph. Checked it with the GPS and it shows 10mph, at 60 mph. Please give as detailed answer as possible, for Im am as lost as can be!