Get the information you need by viewing the Faria 32850 Euro Tachometer Gauge 7000 RPM with System Check Indicator. This item is designed to be compatible with several different types of vehicles. Electronic tachometers work by counting pulses generated by the ignition system alternator tach signal generator or magnetic pickup sender. By setting the switch on the back to the correct position you let it know how many pulses are sent per each engine revolution. The device measures 4 . It can make a useful addition to the rest of your vehicle accessories and parts. This product is available in different colors.