-Be suitable for all kinds of tacho sensors, and display the rotation speed of the engine -Use moving-magnet principle to drive the needle, featuring good endurance and anti-vibration -Operating temperature: -40C ~+85C -Protection rank : IP67 -Fixing dimension: 85mm(3-3/8 ) -Indicating Range: 0-3000RPM 0-4000RPM 0-6000RPM 0-8000RPM -Speed Ratio: 0.5-250.0 / 1.0-10.0 adjustable -Working Voltage: 12V/24V -Choice between red and yellow backlight -Operation mode: LCD display, stepper motor -Protection grade is IP67, the whole body is completely waterproof -Excellent anti-fogging function -316 Stainless steel bezel with curved glass -Convenient Installation by multi-plug socket connecting way 1x Tachometer 1x Multi-plug socket 1x Installation Instruction Be used for gear rotation speed measurement Combining the advantages of stable signal, wide range of operating temperature, small size, simple assembly, etc. It covers a wide range of measurement, and it is able to measure the zero-rotation speed - M16*1.5 (2-wires) Operating temperature: -40 ~85 Output signal: sine wave Signal duty factor: 475% Inductance distance: less than 1mm Tooth module: 2~6 Connecting way: two wires Protection rank: IP65 Length: L=100MM L1=80MM - M16*1.5/M18*1.5 Holzer Tacho (3-wires) Operating temperature: -40 ~85 Output signal: square wave Inductance distance: less than 2mm Operating voltage: 8~32V with polarity protection Connecting way: three wires Protection rank: IP65 Length: L=80MM L1=70 / L=80MM L1=60MM M18*1.5 M16*1.5 Operating Temperature: -40 to 85 Output Signal: Sine Wave Signal Duty Factor: 475% Inductance Distance: Less than 1mm Tooth Module: 2~6 Connecting Way:Two Terminals connection