Mercury - Gen I Throttle and Shift Cable 13 Foot Mechanical Engine Control 8M0082486. 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 boats running traditional Mercury Gen I mechanical control systems, it delivers a familiar, hands-on control feel without electronic involvement. The 13-foot length is well suited for deeper hulls, side consoles, and layouts with longer routing