I had a 1986 225 evinrude with power steering. It had a hydraulic pump that was belt driven from a pulley uner the fly wheel to supply the power. The helm used a conventional steering cable and there was a valve at the motor end. When there was input to steer the motor the valve opened and a hydraulic cylinder gave the push. It was similar in design to the older power assist systems found on cars. You can remove the punp and ram and use it as a regular steering engine.
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