2-digit LED display Adjustable display brightness Suitable for 2- & 4-stroke petrol engines Configurable for engines of between 1 & 12 cylinders Simple installation & calibration Front panel included Contact bounce suppression Many older or base-spec vehicles are not equipped with a tachometer. This situation is easily rectified by installing the digital version presented here which is simple to fit calibrate & use. Furthermore by using a suitable sensor i.e. one that simulates the switching action of the contact breaker the unit allows rpm measurement or the number of movements per minute of any rotating or moving mechanical part it does not necessarily have to be an engine