Do GM's have a PCI-Bus wire?

This is a pretty crazy install, but I just got done installing a Mopar RB1 navigation unit in my 97 Camaro. Looks incredible but I ran across a problem. Apparently this unit uses vehicle speed sensor info and reverse info and obviously satellites to determine position. There is a wire coming out of my mopar wire harness that says PCI-bus and that goes to a diagnostic junction port. It is only a single wire that im assuming gets the VSS and reverse info it needs. What can I connect this PCI-bus wire to in the camaro so that it can get its speed info that it needs?
Thanks for any help.