Mercury - Side Mount Remote Control, 14-Pin, Port Side Outboard Control with Trim 8M0178539. Overview. This control is made for boats where running the throttle with your left hand just feels right. Happens more than people think. It mounts on the port side, trim is built right into the handle, and once it's installed it feels natural pretty quickly. The fifteen-foot harness usually gives you enough slack to route things cleanly without fighting it. Plug it in, set your cables, and you're off-no