Need stereo wiring help in Mustang 08

I have a 08 Mustang 427R with the stock Shaker 500 system. I bought a Pioneer AVIC D3 DVD navigation system to replace it with from Crutchfield. They sent me a basic wiring diagram and harness. However the AVIC-D3 requires being hooked up to the speed sensor. Now I know that the Shaker 500 has speed volume control, SO, I am assuming that the speed sensor line it is already at the harness, however the instructions and the harness from crutchfield do not have it. Can someone assist me with getting this connected, all I need is the proper wire color on the existing harness to connect to. Thanks!

somebody here may be able to help you, but most guys here are old school mechanics, they wont have any idea what color that wire is on a new mustang. Call crutchfield, they have pretty good tech support. I would give that a shot before waiting for a definate answer here.

The Audio unit receives it speed signal from the PCM.
They are bus wires so cutting them is not advised.
Here is the diagram though, and the wires are white w orange stripe and pink w orange stripe.