Suitable for all kinds of vehicle modification, the use of stepper motor drive pointer, accurate display engine RPM, and with the LCD display clear display hour, with instructions of high precision, repeatability and versatility, reliability and stability, drive And control is relatively simple and so on Tachometer using stepper motor drive pointer, accurate display of the engine RPM, and with the LCD display clear display hour Name: Tachometer Materials: stainless steel+nickel-plated plastic Operating Voltage: 12V/24V Connection: Red-Battery(+9-32VDC) Blue-Battery(-) Black-Signal Orange/Yellow-Backlight(+9-32VDC) Indicating Range: 0-3000RPM 0-4000RPM 0-6000RPM 0-8000RPM Input Signal: Pulse Signal from tacho sensor, engine, alternator, ignition coil, crankshaft sensor, etc. Adjustable speed ratio: 0.5-250.0 /1.0-10.0 adjustable Protection Class: IP67, can work underwater 1m position 1 x Tachometer 1 x Cable 1 x Installation Instructions 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 tomeasure 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 -M18*1.5 M16*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=60MM M16*1.5 M18*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