Which gauge measures vacuum in inches of mercury and outgoing water pressure in psi to the discharge side of the pump?

Which gauge measures vacuum in inches of mercury and outgoing water pressure in psi to the discharge side of the pump?

• A. Intake/Compound gauge
• B. Discharge/compound gauge
• C. Tank fill/Recirculating Valve
• D. Engine cooler Valve

Answer: (B)

A compound gauge on the discharge side is designed to show both readings you need: the vacuum on the suction side (inches of mercury) and the discharge pressure (psi). It’s placed on the discharge side so you can monitor the water being pushed to the hose lines while still keeping an eye on suction conditions, all in one instrument. That dual-scale capability is why this gauge is the best choice for measuring both vacuum and outgoing water pressure from the pump. The other options are valves or separate gauges and don’t provide this combined readout on the discharge side.

A compound gauge on the discharge side is designed to show both readings you need: the vacuum on the suction side (inches of mercury) and the discharge pressure (psi). It’s placed on the discharge side so you can monitor the water being pushed to the hose lines while still keeping an eye on suction conditions, all in one instrument. That dual-scale capability is why this gauge is the best choice for measuring both vacuum and outgoing water pressure from the pump. The other options are valves or separate gauges and don’t provide this combined readout on the discharge side.