Mercury - Gen I Throttle and Shift 8 Ft Mechanical Control Cable 8M0085941. The Mercury Gen I throttle and shift cable is designed for Mercury mechanical control systems that need added routing flexibility without excess slack. It is commonly used on small to mid-size consoles where clean cable paths help maintain smooth, predictable control feel at the helm. The 8-foot length provides extra reach to avoid tight bends while keeping the system relaxed and responsive.. Selecting the correct cable