you might consider pricing out all the JD components needed to finish "GS Ready" combine for harvest monitoring w/various gps methods.

Then, price Insight & components you'd need. Insight may work w/gps you presently have. I think AL has trade program for your PF, but irregardless, the PF seems to be having excellent used resale value. Insight & yield monitor components really aren't hard to install in 9660.

It would be interesting to have you checkback w/outcome, whatever you do. Seems we seldom hear final outcomes.

Good luck whatever.