There is some talks about converting mechanical steering to hydraulic specially for the I/O; There is some infos that I think will be appreciate: Most popular (Mercruiser): Power Assist steering = Power steering pump that is operated by the engine power pump which moves the Mercruiser power cylinder (not the Teleflex cylinder)  .  Cylinder required HC5328-3 to work with a SeaStar Helm pump and lines.  You will have a hydraulic power assist steering, meaning, a hydraulic helm pum