Lowrance Autopilot networking between multiple units

[Moxie]

Hello,

Purchased a Hewescraft hardtop sea runner late last year that came with a Lowrance Elite FS 9 at the helm, NAC1 Auto Pilot w/ sea star hydraulic steering. Got the boat out once before winter hit hard; (did have to bust through some ice at huron to get onto erie!) the auto pilot worked great making steering adjustments from the HMI inputs on the Lowrance. Decided I wanted a Lowrance mounted at the business end to be able to make auto pilot steering adjustments out back.. IYKYK. Installed a 12" Elite FS at the helm and moved the 9" out back with just power and ethernet between the two units. The 12' at helm has the transducer and NMEA network connected from a splitter. Everything syncs and works except autopilot on the 9", ALL works on the 12" now at the helm. The aft lowrance connected by only ethernet states no autopilot computer. Is it just a NMEA 2000 I'm missing to the 9" or is it a configuration setting that I am missing? 

Thanks in advance for any help. If you are familiar with these systems, please let me know if you need more info to provide input.