The new Twin Scan II provides diagnostic capabilities not found in any other available tools and is especially useful For diagnosing hard to find intermittent trouble codes. Minimum PC requirement is a 300 MHz Pentium running Windows 98/ME/XP/Vista. Features: • Reads and clears diagnostic trouble codes from ECU (engine control unit), TSSM (turn signal/security module), speedometer, and tach. • Real time display of engine data on instrument panel type display. • Built-in data logging stores up to an hour of data. Includes two analog inputs For air/fuel ratio (AFR). Twin Scan II units can be upgraded to Twin Scan II+ For use as tuning aid, see pn 35-2249 below. Twin Scan II For 2001-2011 fuel injected models with Delphi® system (incl. V-Rod®) and 03-06 carbureted models with 12 pin ignition module.