Tachometer Heavy-Duty Tachometer with Hourmeter (4000 RPM) (Diesel) (Mech Takeoff & Var Ratio Alt) - Black
Perimeter-lighted black dial with bold white graphics, black aluminum bezel, contoured white pointer, and flat glass lens.
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.
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