Ignorance is bliss, but there’s a dark feeling when a pilot realizes there is far less fuel on board than the fuel gauges indicate. Get lucky like I once did and you’ll recognize the inaccuracies inherent with aging analog fuel quantity gauges when you’re on the ground.
The next step is chasing the problem, which means removing the instrument for testing and rebuilding and recalibrating the fuel measuring sensors in the tanks. There are some worthy repair attempts, but compare the all-in troubleshooting, overhaul and gauge replacement costs to a new digital system. The system you’re throwing money at may be as old as the aircraft.