The Ford Racing (FRPP) M-4209ADAPT-A Speed-Dial Speeometer Adjuster/Recalibrator for 1994-2010 Mustang is used to correct your Mustangs speedometer because of tire size or rear gear ratio changes. No longer is it required to purchase a tuner to get your speedo working again!
This speedometer calibrator scales a frequency based on the vehicle speed signal up or down to maintain accurate vehicle speed indication to the instrument cluster and PCM.
1994-2004 Mustang with manual or automatic transmission
2005-2010 Mustang manual transmission
2005-2010 Mustang automatic, but is limited to equivalent of one step higher or lower gear change ratio (+/- 10% change). For example, if your 05 automatic has 3.31 rear gears stock, you can step up to a 3.55 & keep your speedo correct using this adjuster.
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I have been restoring my car for a long time. The engine is a 331 stroker afr 185 heads, trick flow r series intake, 1 3/4 in long tubes with flow master dumps. Sounds awesome and love it every ride. ...