Here is some light reading on the subject. Hopefully you did not trade in your “Obsolete Equipment”. Anyone with a 150 can do this right away, there also is another farmer on here who pulled this off with a Raven guidance system. Teejet also has steering systems run off NMEA.
Need differential for autosteer
Also I am currently working on trying to interface with an Ez 250 and 500.
The news is out Deere is robbing you for $15K just for an RTK unlocked globe and no steering or nav controller. I admit interfacing with the old Trimbles is more of a fun hobby. The real answer is moving to AG OPEN GPS. All I want and need is for the tractor to drive really really straight, I do not feel I should have to donate yearly to the mega corps just so they can steal my crop data, on my dime, waste my time, in an effort for Bayer and Cargill to put us out of business.
RTK saves a pile of time and money, if you can keep it for the Farm.