Adding a 2nd A78 mfd with wifi

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I have added a 2nd A78 with wifi to my boat console and would like them to communicate between each other. WIFI coms does not work. All connections are full in the existing A78. I currently run radar, external gps, and two transducers, one with a dsm. The seatalk connection is used so I cant use seatalk between the units(is there a Y connector?). I think there is an enet switch with 2 of the 4 connections remaining. How do you suggest I get both units working simultaneously.