Ford sale $80 shipped works on 94-10 mustangs, if you change your gears and do not have a hand held tuner this is what you need to correct your speedo , link below
pm me if interested
http://www.americanmuscle.com/ford-speedo-tool-9410.html
pm me if interested
http://www.americanmuscle.com/ford-speedo-tool-9410.html