Why is it important to monitor the gauge during the filling process?

Monitoring the gauge during the filling process is essential primarily to avoid overfilling. LP-gas tanks have specific capacities, and filling them beyond their limits can lead to dangerous situations. Overfilled tanks can cause pressure to build up, which may lead to leaks, potential explosions, or environmental hazards when the excess gas escapes. By observing the gauge closely, the person dispensing the gas can ensure they stop filling as soon as the correct level is reached, maintaining safety and compliance with regulations.

Other options may seem relevant, but they do not hold the same level of significance in the context of the filling process. While ensuring the device is functioning, measuring the liquid level accurately, and maintaining safety standards are all important in the overall handling of LP-gas, the primary immediate concern during filling is to prevent overfilling, which directly impacts safety and operational integrity.