VSS wire in a 01 GT

just got a NAV unit and looking for info on where to locate the vehicle speed sensor wire on my mustang. it is a mach 460 system and i am hoping to just swap out the HU.

thanks in advance, and i will continue to search, if i find the answer before i get a reply i will post it up. planning on taking lots of pics as well to post up for anyone insterested in the process

found the wire on the ECU harness behind the kick panel on the passenger side. White wire with orange stripe. there is a white wire with red stripe, so be careful when hooking it up. the NAV unit looks great and sounds better than the stock unit. my camera flash card somehow got corrupted and i lost my pics of the install. i can say thought, using the metra wiring adapter, made it easy.