Have a 8410 w a early Autopilot, Nav1, 21A lightbar , 252 RTK.    Just Bought a Demo FMD kit & was thinking it would be a nice "upgrade" in the 8410.  

 I thought some of the FM1000s would work with a NAV1, so I figured that "maybe' the FMD would  be a easy install using the NAV1, 252 RTK & hooking the FMD into the system so I can have curve following at a low expense.   

What  am I going to need extra?  I do have a couple NAV11s, but I do have other spots for them.

 TIA