Dynojet Auto Tune Kit For Power Vision For Harley Dynojet Auto Tune Kit makes it possible to adjust cruise for best fuel economy as well as larger throttle openings for peak power. User can specify what air/fuel ratio to make each rpm and throttle position percentage combination. Plugs directly into the Dynojet Power Vision with a single cable. Features: Includes 18mm O2 sensors and power connector that plugs into the bike's harness Makes automatic fuel adjustments User can specify what air/fuel ratio to make each RPM and throttle position percentage combination Makes it possible to adjust cruise for best fuel economy as well as larger throttle openings for peak power Base settings included for air/fuel ratios but are fully adjustable Available for both the Dynojet Power Vision For Harley J1850 Models and the Dynojet Power Vision For Harley CANbus Models (sold separately) Made in the USA See below for fitment guide: At-110 for all J1850 models with 18mm O2 sensor ports O2 bungs not included At-110B for all J1850 models with 12mm O2 sensor ports 18mm O2 bungs included At-120 for all CANbus models with 18mm sensor ports O2 bungs not included At-120B for all CANbus models with 12mm sensor ports 18mm O2 bungs included Note: Because of possible clearance issues, some aftermarket exhaust systems may require modifications or relocation of their sensor bungs.