Auto Meter 4997 Ultra-Lite II 3-3/8" 10000 RPM In-Dash Tachometer Modern white LED through-the-dial lighting provides clear visibility during nighttime use Compatible with 1 - 4 pulse ignition signals (2-8 cylinder engines) with points, electronic, and most 12V high-performance racing ignitions. 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system 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 Gauge kit includes mounting hardware and detailed instructions for installation