My quest for a 9, I failed.

How do you recommend that test be done?

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I run a hose off the regulator to a can.
Ball valve in the end of the line, gauge in the line right before the ball valve.

With the pump running set the ball valve to where the gauge reads the desired minimum pressure you’d be happy seeing down track.
Shut off the pump(don’t change valve setting).
Get your one gallon can ready........ turn on pump and time how long it takes to fill the can while maintaining the minimum desired pressure.
Figure out the gallons/hr of flow you have and compare to the engine requirements.