It just looks like solenoid valves n place of the common ball valves you see.
Center switch position valves vlosed.
Starboard position, starboard valve is open, port closed
Port position, port open, starboard closed
What I do not like about it is that your boat's locomotion is 100% dependant on a continously energized solenoid. Not that it isn't happening on your engine anyway, just something to keep in mind and have a spare for.