Mercury – Gen I Throttle and Shift Cable 20 Foot | Mechanical Engine Control | 8M0085957Mercury Gen I Throttle and Shift Cable 20 Foot Mechanical Engine Control The Mercury Gen I Throttle and Shift Cable is designed for boats using traditional Mercury mechanical control systems that rely on a direct, hands on connection from the helm to the engine. Built for legacy Gen I control interfaces, it delivers predictable throttle response and clean gear engagement without electronic involvement. The 20 foot (6. 1 meter) length is a practical