Speedometer Calibrator
 

Put a Speedometer Calibrator from Dallas Mustang in a customer's 2003 GT yesterday when I swapped in some 4.10 gears. Got to say that the installation was pretty quick and easy, instructions well written and overall a much cleaner installation that some of the mechanical boxes I've seen. I think this unit is pretty much the same as the FRPP calibrator. These typically run about $89 to $95 and take about an hour to install.

Re: Speedometer Calibrator
 

Yea, DM's Speed-Cal is a pretty slick little unit...