Connecting st60 wind, speed and depth to es75

[Art20c]

Hi,
I purchased converter kit, installed it as specified, now st60 speed, depth and wind are all sharing it's data with es75. I can see data from all 3 on mfd, no problem. The only thing that is not seen by mfd is st6001 autopilot. Autopilot is connected to converter via spur cable. The way the connection is set up: Seatalk 1 cable comes from autopilot computer into one Seatalk 1 plug on the back of st6001 controller, and spur cable goes from second Seatalk 1 plug on the back to the white terminal on Seatalk ng converter. What did I do wrong?