This is a fuel tank sending unit with uprated electronics and sealing gasket for a Triumph TR2, Triumph TR3 and Triumph TR3B. The electronics, they are made on modern ceramic with palladium silver conductor pattern that come into contact with the contact arm that is made of phosphor bronze. All of this means long life and accurate measurement. Plus they are immune to the new fuel blends that can reek havoc on the older resistor style sending units. Includes a new Viton Seal.