The Cessna 120 is, at the core, a very basic airplane. Straight out of the factory, the Cessna 120 had an 85-horsepower Continental engine, but an electrical system was optional. The fabric-covered wings lacked flaps, the gravity-fed fuel system required no boost pump, and the fuel gauges registered directly from the wing tanks, right above the side windows. The panel machinery consisted of just throttle, mixture, carburetor heat, cabin heat, airspeed, altitude, tachometer, compass, oil temp and oil pressure. Radios, transponders, VOR heads, turn and bank indicators, and any other luxuries all came later.