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Ford Racing Speedometer Recalibration Tool ('94-'98) - Installation Instructions

Installation Time

60 minutes

American Muscle
Shop Parts in this Guide


Installation on 1994-1998 Mustang:

1. Identify and disconnect the VSS connector from the transmission.

2. Identify the VSS ( ) signal output wire. The wire colors are typically GRAY/BLACK on the VSS ( ) signal side, and PINK/ORANGE on the VSS (-) return side. Remove the harness wrap to expose approximately 6 inches of the VSS wire leads, and cut the GRAY/BLACK signal wire, insuring that there is enough wire remaining on each side to splice in the wires coming from Speed-Dial.

3. Once the GRAY/BLACK VSS ( ) signal wire has been cut, attach the GREEN wire from Speed-Dial to the cut wire coming FROM the transmission. The GREEN wire on Speed-Dial is the SIGNAL IN.

4. Now attach the WHITE wire from Speed-Dial to the remaining GRAY/BLACK cut wire which leads INTO the vehicle harness. The WHITE wire on Speed-Dial is the SIGNAL OUT.

5. Splice the RED wire (using solder and heat shrink) from Speed-Dial to a 12V KEY-ON voltage source. This RED wire should only have voltage when the ignition key is in the 'RUN' position.

6. Finally, attach the BLACK wire from Speed-Dial to a ground source.
Note:For best results, this ground source should be checked for continuity to the negative side of the battery. An optimum ground path should measure less than 0.5 ohms tithe negative battery post. (When measuring resistance, always make sure the key is in the OFF position.)

Alternate Installation for Underhood Applications in 1994-1998 Mustang

1. For under hood installation on a 1994 to 1998 Mustang, the VSS ( ) signal wire can also be found at the right rear of the engine compartment in the black 16-Pin connector.

2. In the 16 pin connector, identify circuit 679, which should be a GRAY/BLACK wire in cavity 15. This is the VSS ( ) signal wire. Use the procedure listed above for installation on this wire. To insure you are working with the correct wire, you should verify continuity to the VSS wire at the transmission BEFORE CUTTING THIS WIRE!

3. You may also use circuit 361 as the 12V Key-On Source. This should be a RED wire located in cavity 5 or cavity 9. Once again, you should verify that this is the correct wire BEFORE splicing into it!

Speed Setting Procedure

Installation instructions provided by Ford Racing

This guide applies to Vehicle years: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 and Submodels: Bullitt, Mach 1, V6, Cobra, GT, GT500

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