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Marine spec b has a governed speed around 4K, but they also have balance shafts fitted, not possible with an automotive spec sump as the balance shaft housing sits below the crank. Not sure I'd turn...

Governed rpm of a 6b is 3400rpm max. But this is dependant on spec with 2800rpm being much more common. So definitely would require diff gears

Either pump is more than enough to operate a cruise actuator on top of the already fitted systems. Very likely it was installed incorrectly or it is faulty