ITEM NAME:1Pc tachometer 4 digital red led tach rpm speed meter with hall switch sensorME Feature: 100% Brand new and high quality. With a standard size, easy to install. Have good stability, high measurement precision. Strong anti-jamming capability. Specification: -Clear zero: Automatic -Display refresher rate: 3 Times/Sec -Display: Red LED -Operating temperature: 0 to 50 °C. Package Included: 1 x Red LED Tachometer RPM Speed Meter 1 x Hall Proximity Switch Sensor.1 x Hall Proximity Switch Sensor. -Clear zero: Automatic. -Display: Red LED. With a standard size, easy to install. Strong anti-jamming capability.