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Electronic tachometers work by counting pulses generated by the ingition system alternator tach signal generator or magnetic pickup sender. The tach is hooked up to 12VDC Ground and one of hte signal sources listed above. By selecting the right tach and setting the switch on the back to the correct postion you let the tachometer know how many pulses are sent per each engine revolution.Features. 6000 RPM Gas - Inboard. Colour - Black. Material - Stainlesss Steel. Size - 10cm .. Colour - Black. Hole size - 3.37 revolution.Feaefits. Wide range of scales. Multiple signal sources. Rugged Reliable construction. 7 character LCD display. 0-999999.9 Hours. Updates in .1 increments