Mercury - Gen I Throttle and Shift Cable 19 Foot Mechanical Engine Control 8M0082492. The Mercury Gen I Throttle and Shift Cable (19 Foot / 5.8 m) is designed for boats using traditional Mercury Gen I mechanical control systems. This cable connects the control box to the engine to deliver direct, responsive throttle and shift movement without electronic involvement. The 19-foot length is ideal for wide-beam boats, deeper hulls, and long helm-to-engine routing where additional reach helps maintai