THG 52mm Digital Blue LED Universal Fit Automobile Racing Smoke Tacho Tachometer Gauge Meter 0-9999 RPM For 12V Car Auto Motor SUV Truck Digital display with black face and blue LED. Special design for measuring the RPM of automobile engine and displays the numbers on LCD Measurement range is 0~9999RPM Red warning light (while 5000RPM) Easy installation - Come with install manual (wiring diagram).