Auto Meter 5343 Digital Black Pro-Shift Tube System Features single programmable digital shift point, adjustable by 10 RPM increments to optimize use of your engine's power band and improve vehicle run performance Compatible with 0.5 - 6 pulse ignition signals (1-12 cylinder engines) with points, electronic, and most 12V high-performance racing ignitions. Features single color shift light with adjustable brightness settings for daytime and nighttime driving or changes in visibility conditions Features Auto Meter's E-Z View Digital LED Display System which maximizes readability and minimizes distracting high speed digit changes Triage engine health and setup changes using Peak RPM Memory recall with one touch review. Commonly referred to as the 'tattle tale' in the racing world, this function allows racers to gain quick insights between rounds about wheel spin, gearing and gear changes.