SPEED-DIAL SPEEDOMETER ADJUSTER

This part is no longer available.
SPEED-DIAL SPEEDOMETER ADJUSTER
M-4209ADPT-A
Instruction Sheet
  • Used to correct speedometer because of tire size or gear ratio changes
  • Fits 1994-2004 Mustang manual and automatic transmission
  • Fits 2005-2010 Mustang with manual transmission. Will correct speedometer. It has no limit on magnitude of gear ratio change for manual transmission vehicles.
  • Fits 2005-2010 Mustang automatic transmission.  Will correct speedometer to equivalent of 10% gear ratio change, higher or lower.

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
Part Type
Electrical: Speedometers
Instruction Sheet
Warranty Availability
Not Available
Packaged Dimensions
4.25" x 1.25" x 4.25
Packaged Weight
0.4 lb(s)
UPC Code
756122116821
Country of Origin
United States