Unifizz Engine Tachometer Gauge 3000 RPM for Diesel with Red Backlight 85mm 12V 24V Engine Monitoring Device

How to be setting Tach RPM Ratio?1. Turn on the power supply first.2. Press and hold the mode button for 3 seconds to enter the setting speed ratio mode. then adjust speed ratio from 1-300 according to your request.3. After setting, Data is automatically saved.4. Please note: If your sensor is installed on the flying wheel panel, the RPM ratio is equal to the number of gears of the engine; If the speed signal takes from W-Terminal, the RPM ratio is equal to the half of the number of poles.5. Normally, When the engine at idle state, tachometer shows 600-800rpm that means speed ratio is correct. If not, you can turn down or turn up speed ratio to check RPM difference.

• Open a 3-3/8" dimension and 2-3/4" depth hole, put gauge into it and fasten - Easy Installation Process.
• Speed Ratio: 1-300 adjustable, You can press the back button to adjust it. Idle speed is typically 600-800rpm. Details refer to owner manual. - Accurate RPM Measurement and Adjustment.
• Suitable for diesel engine. Tachometer can get a signal from the engine, ignition coil, crankshaft sensor, or tacho sensor.
• It shows rpm and hour. Hourmeter cannot be reset. Convenient RPM and Hour Monitoring.
• Red Backlight, 9-32VDC(12VDC/24VDC) Working Voltage, Waterproof and anti-fogging protection - Durable and Reliable Performance.