Vance & Hines Fuelpak for Honda VTX1800 02-06 Throttle-position, sensor-based system simplifies the process of fuel-injection tuning Enables you to fine-tune the fuel mixture throughout the entire rpm range with the touch of a button Increases power and improves throttle response Very user friendly; plugs into the existing harness on the bike No computer or software is required; simply punch in the values supplied with the Fuelpak