Sorry Dutch, but your comment about Zero thrust and Full throttle engines staying in synch, is simply not true. A CSU or governor has stops, and an engine/prop combination that will produce 350HP on one side is simply not going to remain at 2575 RPM when it has 12 inches of manifold pressure applied. Every instrument renewal I do reminds me of this fact. I use these examples as they are from the a/c I usually fly.