What information does the fuel gauge display in a Cessna 172?

The fuel gauge in a Cessna 172 specifically displays the remaining fuel quantity in the tanks. This is crucial for pilots to monitor fuel levels to ensure they have enough fuel for the flight, considering both safety and operational readiness. The gauge provides a direct visual indicator of how much fuel is available, allowing the pilot to make informed decisions regarding fuel management and potential refueling needs during the flight.

In the context of the other choices, the engine temperature is monitored by separate instruments, and the fuel pressure is indicated by a different gauge altogether. Similarly, while an understanding of total fuel capacity is essential, the fuel gauge itself does not convey that information; it focuses solely on how much fuel is left in the tanks. Thus, the primary function of the fuel gauge is to provide a clear reading of remaining fuel quantity, making it critical for flight operations.