::.. Car Speed Signal Input

[Qube]

::.. Car Speed Signal Input

Picked up a Pioneer AVIC-N3 for almost peanuts and trying to install. There's an input for the Car Speed Signal Input. Supposed to tap that wire someplace. Anybody have an idea where I may find such a beast in our wire looms?

http://www.crutchfieldadvisor.com/ISEO-rgbtcspd/learningcenter/car/navigation_installation_guide.html?print=1&page=all

[BillionPa]

i think there are 2 sensors which relay that to the car, one in the rear diff and one at the back of the transmission (i think, know for sure on the diff)