Mercury - Fuel Tank Harness 120-Inch Tank Sender Lead 84-898289T75. Overview. Big offshore engines and high-horsepower sterndrives need reliable fuel-level information, and that starts with a clean connection from the tank sender to the engine's harness. The Mercury 84-898289T75 Fuel Tank Harness provides a 120-inch run designed to link fuel tank senders to engines such as the 350 Verado SCI and the 565-1650 series sterndrives. It also works across the full lineup, including the 450R and even th