The Newport Stainless Steel (SS) collection of nautical gauges is a traditional gauge reimagined as the new Modern Retro. Faria (F45005) Tachometer with Hourmeter. For Gas and Outboard Engines. These tachometers function by calculating pulses from the ignition system, alternator, tach signal generator, or magnetic pickup sender. +12V DC, Ground, and one of the signal sources specified above connect the tach. Selected tach and back switch positions tell the tachometer how many pulses are supplied for each engine rotation. This Retro Style gauge far surpasses expectations with its cutting-edge fog-resistant technology. Plus! Its perimeter illumination makes it simple to view these gauges Day/Night. Key Features: Retro White Dial with Perimeter Illumination Graphics in Black and Gray The lens with a domed shape that repels the fog Black pointers in two pieces Bezel in Stainless Steel that has been hand-polished For ring terminals, studded connection Edge-lighting with a red glow Without lighting, current consumption is less than 100 mA. Made from high-quality materials A high-quality design ensures a longer lifespan Specifications: Brand: Faria SKU: F45005 Weight: 0.68 LBS Style: Newport SS Gauge Size: 4 Measurement Limit: 7000 RPM Operating Voltage: 11.5 to 16 volts Nominal Voltage: 14.2 volts Operating Temperature: -4 degreeF to +158 degreeF Storage Temperature: -22 degreeF Torque: .57 - .80 Nm Mounting Hole: 3-3/8" (85 mm)