I am currently switching all my audio equipment from my old '96 to my '97. One feature that I did not install on my Blaupunkt Casablanca in the '96 is as the speed of the car increases, the volume of the radio increases as well. This wire is supposed to hook up into the speed sensor. So, my question is where this wire is on the ECU? What color is it? I have a '97 5 speed. Help me out.... thanks!

Shawn