Mercury - Gimbal Housing Steering Lever Steering System Marine Alloy 866322A01. Overview. If you have ever handled a boat in tight quarters on a windy day, you know how much trust you put in your steering system. That steady, predictable response at the helm isn't luck - it's the result of solid hardware doing its job without complaint. The gimbal housing steering lever is one of those hidden heroes. Mercury Marine part number 866322A01 gives you the kind of dependable control that makes docking