Ford Performance Speed-Dial Speedometer Adjuster for 1979-1993 Coyote Swapped Mustangs

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.

Fits Vehicle:
1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993 Mustangs
1979, 1980, 1981, 1982, 1983, 1984, 1985 Mustangs

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Ford Racing parts are sold "as is" without any warranty whatsoever. The entire risk as to the quality and performance of such parts is with the buyer. The buyer, and not the manufacturer, distributor, or retailer, assumes the entire cost of all necessary servicing or repair. Parts thought to be defective upon initial installation can be returned for inspection and will be handled case-by-case. The exception to this warranty is that Ford Racing Performance warrants to the original retail purchaser for 12 months or 12,000 miles, whichever comes first, that it will repair or replace, at its option, using new or remanufactured parts, Ford Racing Performance Parts engine covered parts that, after inspection, are found to have failed due to a defect in factory-supplied materials or workmanship. The customer must contact Ford Racing Performance Parts directly at (586) 468-1356 regarding this warranty.

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