If all you want to do is measure the pressure drop of some item in a test, you can put a valve in the line after the second manometer and restrict flow which will increase pressure to both manometers allowing you to be able to see more clearly the change. It will also let you set up a common starting point for all tests. You just have to keep some flow going so the pump does not get to it's shutoff point.
The biggest problem you will have is that you will be looking at relatively small changes in water level in the manometers. I think...
The smaller the tubes used for the manometers the faster they will respond to a change. You don't have to wait as long for the system to reach equalibrium.
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