Mercury - Gen I Throttle and Shift Cable 32 Foot Mechanical Engine Control 8M0082504. The Mercury Gen I Throttle and Shift Cable (32 Foot / 9.4 m) is designed for boats using traditional Mercury Gen I mechanical control systems where extra-long routing distance is required. This cable connects the control box to the engine to deliver direct, responsive throttle and shift movement without electronic involvement. The 32-foot length is ideal for wide-beam boats, deep hulls, and long helm-to-engine