Something to consider.... Under most circumstances, you will be trolling with one engine. If your boat is like mine, there is power steering assist on only one engine. To keep engine hrs. similar on both engines, you will likely troll about half of the time on each engine. This means that when using the non power assist engine to troll, you won't have power assist (unless you leave the other engine running). Without power assist, steering is possible but stiff. If using an AP in this application, it could be a heavy load for the AP. Converting to hydraulic steering eliminates these issues.