Kit includes ignition system, 8.5mm spark plug wires, single-fire coil and instructions Ignition system has two advance curve families with adjustable advance curves to accommodate stock to wild engine modifications Four rotary switches for adjusting timing and single/dual fire rpm limit Digitally set rpm limit (in 100 rpm steps), selectable single- or dual-fire mode Selectable multi-spark mode for quick starting and smooth cruising Coil outputs protected against short circuits Uses the tachometer wire for the USB interface and comes with a connector Made in the U.S.A.. IGN KIT 70-99 BT 71-97 XL