The Fuelpak LED and LCD models are plug-and-play fuel controllers providing custom-tailored fuel mapping for all Delphi fuel injected Harley-Davidson® models using SAE J1850 connectors and certain HDLAN connector models| that install in-line with the ECM and modify the output signal to the fuel injectors. Duplicate O.E.M. connectors for easy installation. Simple push button interface for data input. Over 10|000 map configurations available. Designed and manufactured in house.