for more detailed tests, watch Seth Johnson @ Land to House on YouTube.
I believe ram pump requires pressure equal to the height you need to deliver water. This is contingent on the head pressure (height of drive pipe + hydrostatic overhead.) Pump pressure is also controlled by the type of check valves used in assembly.
In my opinion, the drive pipe length should be between 6 and 10 times the height of the drive pipe intake.
Optimum output can be achieved with a ratio of 4 or 5 to 1; delivery height to head. Many pumps can reach a ratio of 7:1; but with questionable results if sufficient water supply is not available.
Too much pressure is bad for low elevation; low pressure is bad for high elevation delivery. The check valve is critical to controlling pressure.
Tilted waste valves greatly reduce pump efficiency.
For easier reading, buy a "pool pump pressure gauge" from Amazon. Requires adapters to fit your outlet "Tees," but well worth the trouble.
200 PSI gauges are pretty much useless for ram pump applications.