09TahoeFD

Hey guys, new to the site; Installing the 8100 NEX on my 09 Chevy Tahoe w/ stock radio, no OnStar. Have done many radio installs before, but ran into a few dead ends with this one; My stock radio had ASL and auto-illumination when the headlights came on. Does this mean the Harness I got should just plug and play, or do I have to find a VSS wire and an illumination wire separately? If so, does anyone know where I could find those two leads?