Here's a quick diagram (below):
In short, you put tees at the inlet and outlet of what you're measuring (in this case, a heatercore). The coolant comes in one side, and out the other. The pressure drop will appear in the form of a different height of water, in the vertical tubes.
FYI, it's a lot (!) easier if you mount the vertical tubes on a board, and put some horizontal lines, for measurements.
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