I am tring to recalibrate my speedometer. I know there are shops that can do it but I would like to do it myself. Does any one know how to do this or what mechinery is needed for this work. I thought if I could recalibrate it and use a white face gauge for the numbers. I have heard of there being a new stock 140 replacment face for these but I cannot fimd those either. By the way this is for a 84-86 Mustang. Thanks in advanced.

 

what your going to need is a speedo gear. it sits in the back of the trans and is held in by one bolt. the only tools you should need is a pair of pliers and a wrench.

 

hes not talking about the tranny gear hes talkinga bout actually recalibrating the speedo, taking it off and making sure its reading correctly

 

So it isn't reading accurately? Or it is, but you want to recalibrate it for a 140mph guage? & what is the gearing in the rearend?

 

This has nothing to do with the rear end gears or the tranny speedo gear. I am trying to take an 85mph speedometer and make it a 140 mph speedo. I know this is possible but I have no idea how.