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Product DescriptionThe Faria 4" Dress White Series Tachometer features a perimeter-lighted white dial with bold black graphics, white aluminum bezel, and a flat glass lens. Fits 3.375" (85mm) hole size. Benefits include a wide range of scales, multiple signal sources, and rugged, reliable construction.
Electronic tachometers work by counting pulses generated by the ignition system, alternator, tach signal generator or magnetic pickup sender. The tach is hooked up to +12vDC, Ground and one of the signal sources listed above. By selecting the right tach and setting the switch on the back to the correct position you let the tachometer know how many pulses are sent per each engine revolution.