VSS on 07 Ford Expedition

Hi everyone,

I'm installing a moving radar setup for a local public safety department. So far I've only done this for crown vics, and it's relatively easy to find the VSS wire to tap into. I'm having trouble finding it on the Expedition.

This is a 2007 Ford Expedition, basic package. I've read the wiring guide posted in the forums for this year and the F-250 has it listed on the interior drive-side firewall, listed as a gray/black wire. When I got under the dash, there were a LOT of plugs, harnesses, and adaptors, taped and wrapped up. Before I start splitting everything open to find a gray/black wire which may or may not be the right one, I was wondering if anyone had prior experience in this and could point me in the right direction.

As always, thanks for your help and expertise.

-mindctrl