The Longacre Digital Tachometer incorporates state of the art internals providing optimum accuracy to within 10rpm. The unit has been designed to provide an easy to read display in a variety of cockpit situations whilst remaining ultra lightweight at approximately 42g (1.5oz). Lightweight and compact dimensionsIncludes a mounting bracketSimple 3 wire hook-up (2 Wires if optional backlight and RPM warning light are not required)Accurate to within 10 RpmBuilt in high RPM warning lightThe unit includes a backlight for readability in low light conditions, and a  high RPM warning light to help prevent over revving the engine (please note, this unit is not a rev limiter). Also includes a recall function to easily recall previous RPM readings.The unit is available in two RPM configurations: 10,000 RPM 19,000 RPMDimensions: 88mm x 37mm