Mercury - Gen I Throttle and Shift Cable 27 Foot Mechanical Engine Control 8M0085944. This Mercury Gen I throttle and shift cable is designed for boats using traditional Mercury mechanical control systems that require extended cable routing. It maintains a direct, dependable connection between the control box and engine to keep throttle and gear changes feeling natural and predictable at the helm. The 27-foot length supports longer console-to-engine layouts and wider hull configurations where cl