The Electronic Flight Instrument (EFI) is our entry into the multi-function instrument field. This unit simultaneously displays RPM, two exhaust gas temperatures, two cylinder head or one coolant temperature, altitude, vertical speed, flight timer, total engine timer (Hobbs) and a very versatile AUX(iliary) function. Display contrast can be adjusted for viewing angle from the normal seating position. It is available in a rectangular format or a larger round package that includes two momentary magneto test switches.