MATCC Tachometer Tach Gauge with Holder Cup for Auto Car 2'' 52mm 0~8000RPM Blue LED Light 2" 52mm Tachometer.Small, effective, and simple.High sensitivity and easy operationused to measure the RPM of automobile engine. 52mm white tachometer that works great for either 4,6, or 8 cylinders engines.White face with blue LED,Tacho reads from 0 - 8,000 RPM. Blue LED light for easy reading in the darkness. You can wired to a dimmer switch so that you can control the light output. Base works well to hold the gauge stationary in the loop that holds one side of the engine hood to the car and super easy to hook up. You can pop it out of the cup holder and just pop it back into new twin pillar holder.