New to GPS and precision ag and picked up a EZGuide 500 last year for basic light bar guidance.  So this spring I acquired a new to me Combine (JD 9400) that has a PF Advantage monitor installed.  Since I do not see any GPS system or antennae I am guessing it was used for yield monitoring etc. only with no mapping capabilities.  Can I attach the EZ Guide 500 to it for GPS and create yield maps?