Faria Chesapeake White SS 4" Tachometer w/Hourmeter - 6000 RPM (Gas)(Inboard) [33832]Chesapeake White SS 4" Tachometer with Hourmeter 6000 RPM (Gas) (Inboard) Perimeter lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed 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. By selecting the