Final answer:
The system vacuum gauge should be located at the point where an accurate vacuum reading is desired, such as near the inlet or outlet of a vacuum chamber.
Step-by-step explanation:
The system vacuum gauge should be located at the point where an accurate vacuum reading is desired. This location will depend on the specific system being evacuated. For example, in a vacuum chamber, the gauge should be placed near the region of interest, such as the chamber's inlet or outlet. By placing the gauge at the desired location, it can measure the pressure accurately in that specific area, providing valuable information about the vacuum level at that point.