and high quality Protection grade is IP67, the whole body is completely waterproof. 316 Stainless steel bezel with curved glass. With polarity reverse protection function. The durability is good, and the seismic performance is Specification: Type: Digital Tachometer Material: Metal and Color: As picture shown Backlightas the picture shown Indicating Range: 0~9999 RPM Working Voltage:9V-30V DC Operating temperature:-20~+70 Storage temperature:-30~+80 Working current:100mA Installation Dimension: 85mm Waterproof IP67 Function Tachometer (Display RPM of your engine) Oil Pressure (Bar or Psi up to 10 Bar or 145 Psi) Water Temperature (40-120C or 104-248F) Voltmeter Fuel Level Sensor Failure Alarm Connection Black: Ground(-) Red: 9-30VDC Blue: RPM Yellow: Water Temperature White: Fuel Level Package Includes: 1 Piece Digital Tachometer