Tachometer for gasoline engines – 85mm, white dial/Chrome bezel, Electronic, 0 – 7000 RPM. This instrument is designed to operate only on 12 Volt DC systems including inboard and stern drive four cycle gas engines with standard ignition or factory installed electronic ignition, or on outboard engines (2 and 4 cycle) with alternator/stator having 4,6,8, 10 or 12 magnetic poles. This high quality gauge is MANUFACTURED IN THE USA. These gauges have scratch-resistant lenses, corrosion resistant bezels and brass terminal connectors. These are illuminated for excellent night visibility and have anti-fog coating. These are specially designed for marine conditions.