Ford Performance Speed-Dial Speedometer Calibrator (1979-93 Coyote Swap)
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The Ford Racing M-4209ADAPT-AC Speed-Dial Speeometer Adjuster/Recalibrator for 1994-2010 Mustangs is used to correct your speedometer because of tire size or rear gear ratio changes. You no longer need to purchase a tuner to get your speedo working again! This little box is also very helpful for the 1979-1993 Fox Body Mustang owners that have performed the famous Coyote Swap.
Note: To maintain cruise control function on 2005-2010 Mustang automatic and manual transmissions, gear change is limited to equivalent of 5% higher or lower ratio (<+/-5% change). For example, a gear change from 3.55 to 3.73 results in a gear ratio reduction of 4.8% so cruise control will continue to operate normally. A gear ratio change from 3.55 to 4.11 results in a gear ratio reduction of 13.6% so cruise control operation is lost.
- The Speed-Dial scales a frequency based vehicle speed signal up/down to maintain accurate vehicle speed indication to the instrument cluster and PCM.
- Easy 4 wire installation
- No reprogramming of PCM necessary
Note: On 2005-2010 Mustangs with Manual Transmission, it will correct speedometer, and has no limit on magnitude of gear ratio change for manual transmission vehicles, but ont the 2005-2010 Mustangs equipped with the Automatic Transmission it will correct speedometer to equivalent of 10% gear ratio change, higher or lower.
1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993 Mustangs
1979, 1980, 1981, 1982, 1983, 1984, 1985 Mustangs