Viewline 4-3/8" (110MM) Onyx 4000 RPM Tachometer with Multifunction LCD - BlackProgrammable tachometers feature: User defined rev. limit warning, LCD display for total hours, resettable hours, voltage and clock. Accepts signal inputs from electronic controlled ignitions with tachometer output terminal, standard coil ignition, alternator signal and 12V square wave applications.Features:Diameter: 4-3/8"Voltage: 12-24VInput Type: AnalogConnection: Tyco connector (included)