All Private Pilots should know the acronym TOMATO FLAMES for the Minimum Equipment List (MEL).
On that list, F means Fuel Gauges.
But what exactly is required of fuel gauges?
Yesterday, my rental plane came with a note that the fuel gauges were swinging wildly, and bouncing to zero occasionally. I planned a 90 minute flight, starting with full fuel, so there was no real risk of running out of gas.
I decided the fuel gauges probably didn't meet the spirit of TOMATO FLAMES, but I admit that I don't know what the exact requirement is.
How accurately do the gauges have to work to be legal?