Faria Chesapeake White SS 4" Speedometer - 60MPH (Pitot) [33811]Chesapeake White SS 4" Speedometer 60MPH (Pitot) Perimeter lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens. Electronic speedometers operate by capturing pulses produced by a sensor. the pulses are then electronically converted to a speed reading very much like a tachometer converts ignition pulses to RPM. Pitot tube type speedometers operate by pressure from the