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Download Literature Faria 39004 Gauges Kronos 4" Tachometer - 6,000 RPM (Gas - Inboard & I/O) 4" - Hole size: 3.375" (85mm) 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 …