Mercury - Fuel Tank Harness 240-Inch Tank Sender Lead 84-898289T76. Overview. Large offshore rigs and high-horsepower sterndrives often place the fuel tank far from the engine rigging point, and a standard harness just won't reach. The Mercury 84-898289T76 Fuel Tank Harness gives you a full 240 inches of length-enough to make a clean, reliable connection between the tank sender and engines like the 350 Verado SCI or the 565-1650 Racing sterndrive series. It's built for long runs where accuracy a