Mercury - Gen I Throttle and Shift 12 Ft Mechanical Control Cable 8M0085949. The Mercury Gen I throttle and shift cable is designed for Mercury mechanical control systems that require a balanced mid-length routing between the helm and the engine. It is well suited for small to mid-size consoles where clean cable runs help maintain smooth, predictable control feel. The 12-foot length provides enough reach to avoid tight bends while keeping the installation tidy and properly supported.. Using the