How can I tell if my 8130 is Autotrac Ready?  The sticker on the door glass say "Greenstar Ready" does that also mean Autotrac?  I have a odd feeling not.  I need to know in order to get a Trimble Autopilot system ordered.  It was stated that if the tractor is just "Greenstar Ready" it might not have the proper valve and therefore need $2000-3000 add'l to get up and running.  Thanks.