What is required to be indicated by gauges or readout devices?

The required information to be indicated by gauges or readout devices includes compression discharge pressure, storage pressure, and dispenser discharge pressure. This is crucial for ensuring the safe and efficient operation of CNG delivery systems. Monitoring these pressures is essential for several reasons: it helps operators understand how well the system is functioning, ensures that the conditions are within safe operational limits, and allows for adjustments to be made to optimize performance.

Compression discharge pressure indicates how much pressure is being exerted by the gas after it has been compressed, which must be monitored to avoid over-pressurization that can lead to equipment failures. Storage pressure is important to ensure that the CNG is stored at optimal levels for safe transport and distribution. Dispenser discharge pressure is vital for ensuring that the gas is being delivered correctly at the appropriate pressure for end-users.

While other gauges, such as those for fuel consumption rates, ambient temperature, humidity levels, vehicle speed, and tire pressure, serve important functions in their respective areas, they are not specifically required to be indicated by the gauges or readout devices pertinent to CNG delivery systems. Focus on the pressures specifically ties directly into operational safety and functionality, which is why this option is the correct choice.