Which of the following statements is true concerning the gauge labeled "A" of the illustrated gauge manifold set? Illustration GS-RA-01

Correct Answer: Option A — The gauge labeled "A" is a compound gauge and is usually color-coded blue.

Gauge A on a standard marine refrigeration manifold is the low-side compound gauge, designed to measure both positive pressure and negative vacuum readings, and is universally color-coded blue for easy identification.