Here is a writeup I made for my site
http://www.svt4u2try.com/Tech.html
DMP Speedcal
1. Remove the negative battery cable.
2. Set bank 2 switch settings as follows 1000000
3. Remove the shift knob, outer shift boot, and inner shift boot. It will be easier to remove the cigarette lighter/auxillery
jack/traction control. The outer boot can be snapped off with eas. The inner boot requires an 8mm socket.
4. Route the Speedcal harness down the drivers side of the transmission, and re-install inner boot. Place the Speedcal to
either the front or rear of the inner boot. I placed it to the front under the cd player.
5. Using a scrotch lock, connect the red power wire of the Speedcal to a 12 volt power supply, like the cigarette lighter hot
wire. Usually this is a blue/white wire.
6. Under the vehicle , locate and remove the Vehicle Speed Sensor(VSS) located on the driver's side of the transmission.
*** not the Output Shaft Sensor (OSS) which is located at the rear***
7. Pull out the VSS and with a small flat head screw driver remove the red thin contact lock from the connector shell. Then
carefully slide the screwdriver down each side of the contacts and pop the retainers and remove both contacts from the
connector shell.
8. Take the connector shell and lay in down where the flat part is down. Then install the green wire from the speedcal in
the left contact hole, and the blue wire in the right contact hole until you hear a faint click. Then re-install the red contact
lock.
** If the contacts are locked in properly, you will not be able to pull the wires out unless you release the contact retainer**
9. Reconnect the VSS back on the transmission.
10. Now the two old VSS wire you need to determine which wire is the ground wire. On a 94-98 Mustang it is a pink/orange
wire, and on a 99+ it is a gray/red wire.
11. Find the supplied connector shell from the Speedcal package, and wire in the ground wire from the old VSS, making
sure it will match up with the gray wire from the main harness on the Speedcal. Then install the final old VSS wire in the
only other connector hole in the connector shell and snap that into the Speedcals main harness connector making sure
the old power wire matches up with the gray wire on the speedcal. You can hold up the excess wiring by using EZ ties.
** these are held in the same way as the VSS connectors are**
12. Reconnect the battery and set the bank 1 switches for the proper ratio. You can access this formula and others
here
Troubleshooting.
The Speedometer does not move at all.
Make sure the red power wire is installed
Make sure that Bank 2 is set 1000000
Make sure all wires are installed properly and in order
Make sure you did not blow a fuse
I hope this helps you to have an easy install of your DMP Speedcal
. Any tips one how to get this thing in the car? 
