Fuel sender with 100 ohm input resistance. Installs into the fuel tank from above. Requires a 35mm dia hole in the top of the tank for installation. Includes a rubber grommet for a frm seal. The tank will read 'Empty' when the foat is at full extension, 128mm from the top of the tank. The tank will read 'Full' when the foat is raised to its peak position, 40mm from the top of the sender. At full extension the top of the foat will be 155mm from the top of the sender, however, the float position can be adjusted to suit the shape of your tank by bending the float arm.