Mercury - Gen I Throttle and Shift Cable 11 Foot Mechanical Engine Control 8M0082484. The Mercury Gen I Throttle and Shift Cable is a mechanical control cable designed to connect the control box to the engine for direct throttle and shift input. Built for legacy Mercury Gen I mechanical control systems, it delivers a predictable, familiar control feel that's especially important for docking, low-speed maneuvering, and everyday operation. The 11-foot length supports cleaner routing on wider hulls