MuuMuu101's 68 Dart, A Learning Process...

I'm a little surprised here, does the kit allow pulses per mile programming? The transmission already has a VSS electronic speed sensor in it, on the passenger side that uses a Ford connector (Standard Motor Products S699, I believe for a 2004 Mustang with a 5-speed). Should be 17 pulses/revolution
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Also your reverse lockout solenoid isn't hooked up? That's the connector right above the mechanical speedo take-off. I have mine powered by megasquirt when the vehicle is under 5 mph so it's a breeze to stick in reverse.

The kit sort of uses a pulses per mile calibration. To calibrate it, you hit a button to start the calibration, drive a mile, and the system records the pulses when you tell it the mile is over. Or you can use a GPS sensor and don't have to deal with calibration.

See, I always was confused about where the speed sensor goes. Everywhere I looked online said it was on the driver side. So, I thought there may be 2 locations on the T56 Magnum, one for a mechanical assembly and one for an electronic version. I guess I should have looked at the passenger side. Here is the speed sensor connector the kit uses. I noticed it was a little different from the factory ones as this sensor requires a power, ground, and signal wire.

Intellitronix Speedometer Sending Units S9013