Experience a new level of performance monitoring with the Speedhut Shift-Light Tachometer – an essential instrument that features intensely bright shift lights for enhanced performance monitoring and can be calibrated from 1/2 pulse to 6 pulses per rev. This high-tech tool guarantees pointer precision even in demanding racing conditions, providing real-time RPM readings to maximize your engine's power. Calibrated to seamlessly work with any gas engine and tach signal over one volt, its rugged build and easy installation make it an indispensable instrument in achieving peak engine efficiency and responsiveness. For easier install also purchase these adapters: https://www.ebay.com/itm/375239350365