 your best bet is to find a speedometer or transmission shop in your area to do that. you will spend alot of money in doing this as well as being without a speedo for some time,(like over a couple of weeks)just my thought, and that is who had done mine.
__________________ 1975 Mustang II V-8 Coupe, 1985 GT Hatchback stock, 1986/91 SSC/GT Hatchback, 1988 GT Convertible personalized, 1993 LX 5.0 Hatchback, MCA stock,photos in Mustang Forty Years and Mustang Four Decades Of Muscle Car Power, 1969 Cougar XR7 (eliminator clone), 2006 Dodge Charger Daytona R/T #996 (the wife's toy) 1999 Dodge Dakota R/T 5.9
got nitrous? only babies, and little boys with bowties use bottles!
they can take away my keys from my cold dead lifeless hands, if they can catch me first | 
Brothers Performance speedo Recalib.? 
