Daytona Twin Tec Fully Programmable Ignition For Harley This fully programmable ignition features two advance curve families that are adjustable to accommodate stock and modified engines. Selectable multi-spark mode for quick starting and smooth cruising. Features: An upgrade from the non-adjustable stock OEM unit Features advanced electronics set into a billet aluminum housing Four rotary switches are used to set the operating modes (such as single or dual fire), adjust the timing advance, and select the RPM limit Two diagnostic LEDs indicate the status and the state of the vacuum switch (Voes) The status LED is also used to indicate top dead center (Tdc) for easy timing set-up A special feature allows use of the tachometer wire for a link to a laptop PC While the customer does not require the PC link for any normal set-up or operation, it can be used to access additional features for precise dyno tuning (such as programming a custom advance curve and setting rear cylinder timing offset) Windows compatible software is freely available for download at the company website PC link cable sold separately Made in USA