Tunes can correct for inaccurate speedometers on 1999 and up Mustangs as they use an electronic gauge system. 1998 and older Mustangs use a mechanical gauge system that will need either a new speedometer gear to be installed. 1994-2010 Mustangs may also optionally use a “Speed Cal” tool to trick the computer into reading the correct speed without changing gears or tunes.
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