Auto Meter 3690 Sport-Comp II 3-3/8" 10000 RPM Shift-Lite Tachometer Modern white LED through-the-dial lighting provides clear visibility during nighttime use Compatible with 0.5 - 6 pulse ignition signals (1-12 cylinder engines) with points, electronic, and most 12V high-performance racing ignitions. Auto Meters race proven air-core electric tachometers provide quick and accurate readings with a needle so responsive it can go from 0 - full scale in 333 milliseconds 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system Optimize use of your engine's power band and improve vehicle run performance and driver gear changes with a rapid response, high visibility user-programmable shift light.