HTG THG 60mm Digital Red LED Universal Fit 12V Motorcycle Touring Racing Bike Smoke Tacho Tachometer Gauge Meter 0-9999 RPM Digital display with black face and Red LED Easy Viewing at all angles under any lighting conditions Special design for measuring the RPM of motorcycle engine and displays the numbers on LCD Measurement range is 0~9999RPM. Easy installation - Red wire for Anode, Black for cathode, Green for Tacho signal wiring