Open a 3-3/8 inch dimension and 2-1/5 inch depth hole, put gauge into it and fastenMade of high-quality 316 stainless steel for long-term use even in acid-base, humid environmentA 4-in-1 multi-function digital meter integrating Tachometer, Water Temp, Oil Pressure Gauge,and VoltmeterThe instrument has its own alarm signal, and no need additional alarm signal by the sensor.High brightness LED backlight, high brightness and long life.Tachometer: 0-9999RPMSpeed Ratio: 1.0-360.0; Step Value: 0.1Oil Pressure: 0-10 bar/0-145psi (Pressure sensor: 10-184ohm)(After power on, press the back button to adjust unit, if the oil pressure unit is "psi", the temperature unit will be "Fahrenheit".)Water Temperature: 40-120 Celsius/100-250 Fahrenheit (Temperature sensor: 301-22ohm)(The water temperature is displayed by default.)Voltmeter: 9-32VTotal Engine Hours: 0.0-99999.9H(Press the back button to adjust)Sensor Fault Alarm(Chinese and English can be switched)Degree of Protection: IP67Backlight: TFT ScreenColour:blackMaterial:stainless steelSize:85mm diameter (3-3/8 inch)55mm Depth (2-3/4 inch)Package Contents:1 x 4 in 1 Gauge1 x multi-plug socket1 x Chinese and English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.