Autopilot repair

Hi,
I recently installed the following components replacing an older SPX30 computer which was faulty.
ACU-200, EV-1 Sensor Core.
I am reusing the ST6002+ Head Controller and hydraulic pump (Type1).
I am getting a "NO Pilot" message on the ST6002.
I have used the SeaTalk to SeaTalkNg converter kit and terminated the backbone.
The ST6002 plugs into the yellow SeaTalk connector, the Ev-1 and ACU plug into the other two white spur connectors.
Power for the backbone comes from the ACU200 via the spur cable.
Am I missing anything here?

Thanks