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 environmentThe 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: 0-9999RPMOil 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)Voltmeter: 9-32VFuel Level: 0-100% (Press the back button to adjust the level signal:0-190 ohm/240-33 ohm available.)Total Engine Hours: 0.0-99999.9H(Can be adjusted by the back button.)Degree of Protection: IP67Backlight: TFT ScreenSetting:Keep on pressing the back button for 3 seconds,and then enter into setting mode,if leave button more than 3 seconds,it will be out of setting mode.The value will increase when you press the button. When you leave the button and then press it again,the value will decrease. The minimum step value is 0.1 and the adjustable range is 1-360.(tachometer setting)When you get the required speed ratio value after adjustment,please leave the button. The tachometers will autoclave your setup after 3 seconds. If the setup doesn't meet your demand,please re-setup.Colour:whiteMaterial:stainless steelSize:85mm diameter (3-3/8 inch)55mm Depth (2-1/5 inch)Package Contents:1 x 5-in-1 Multifunction Gauge1 x multi-plug socket1 x Chinese and English manual1 x Connect to oil level sensor signal lineOnly 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.