Mercury - Gen I Throttle and Shift Cable 17 Foot Mechanical Engine Control 8M0082490. The Mercury Gen I Throttle and Shift Cable (17 Foot) 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 17-foot length is well suited for wider hulls, deeper consoles, and longer helm-to-engine routing where shorter cables may pull tight o