What is the lowest pressure gauge reading a technician can expect while servicing an automotive AC system?

While servicing an automotive AC system, a technician can expect the low-pressure gauge reading to typically range between 25 to 45 psi under normal operating conditions. However, during recovery or when the system is off, it can drop as low as 0 psi if the system is completely evacuated. It's important for the technician to refer to the specific vehicle's service manual, as pressure readings can vary based on the type of refrigerant and the system design.