where do you buy the piece to recalibrate speedo after gear change?(not a tuner)about how much?thanks guys

 

they do make this?

 

It would help if you told us what year your car is...

 

I bought mine for about 15 bucks from the guy who did my install, but you can get it from 50resto.com.

 

DallasMustang speedcal...

 

Did you try jegs.com?

 

I wana kno wthis too, my 97 has 3.73 gears in it an dthe speedo is off

 

Exactly!
Newer Mustangs do not use the replacable plastic gears that correct the speedo.
You need either a Speed cal, tuner or get the Ford dealer to reprogram it.

If it is an older one (98 or older) you can search ebay, there area fewthere.