HOTSYSTEM New Universal Electronic Tachometer Tacho Gauge Meter Blue Digital LED 2inches 52mm 0-9999 RPM for 4 6 8 Cylinder Car Vehicle Automotive Just fit 4/6/8 Cylinder and DC12V! Warning signal: Light will light up in red when revolutions exceed 5000RPM. Read range:Our gauge will precisely measure the engine and crankshaft revolutions per minute of your engine that is between 0-9999 RPM. Easily display at night:Our gauge is highly visible with a blue digital LED,easy viewing at all angles during any lighting conditions. Easy installation:Our gauge includes electric wire with necessary mounting and installation hardware,no need any sensor. Warning signal: Light will light up in red when revolutions exceed 5000RPM. Easily display at night:Our gauge is highly  visible with a blue digital LED,easy viewing at all angles during any  lighting conditions. Easy installation:Our gauge includes electric wire with necessary mounting and installation hardware,no need any sensor.