Hey Ship, for Rains' boat - it is a twin diesel I/O with power steering running from the running main engine, and not from a SeaStar Power Steering pump. In order for the power steering to be working his main engine must be running.
When you try to tee the kicker hydraulic helm into the main engine helm / autopilot you run into some issues with 1. the load on the pilot to turn two legs on a power steering system when the power steering pump isn't running, and 2. you run into issues setting a hard over time for the kicker ram vs the main power steering rams. There has been some work done at IMC/Ocean Sport boats with manually operated hydraulic selection valves inline to isolate the mains from the kicker and the kicker from the mains depending on what you are doing (fishing vs. cruising) but it introduces some liability for accidents when the valves are accidentally put in the wrong configuration and again some hard over time issues between the two systems.
In this case it might just be easier to keep the kicker steering discrete from the main steering, and have a discrete autopilot for the kicker.