An in-line Tee fitting would be the correct way to measure the running pressure. Kits often come with tee fittings in different diameters to facilitate the measurement with different size fuel line. Easy to do if the fitting on the carb is a barbed fitting. Just add a short stub hose to the carb's barbed fitting. Shove the Tee into the stub and then the original supply hose on to the other side of the Tee with the gauge off of the tapped arm of the Tee. Clamps are always a good safety feature.
If more convenient you can do the measurement at the pump outlet. The distance between the pump and carb will be immaterial.
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