2" Hourmeter (Digital) 10,000 Hours 12-32VDC Dress White *Bulk Case of 24*
Hole Size: 2"
Perimeter-lighted black dial with bold white graphics, black aluminum SAE style 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.