How to test fuel pump? How to attach pressure gauge?

Stock 1973 Dart 318 V8. The 1973 shop manual shows how to use a pressure gauge to test outlet pressure on the fuel pump. The book says to install a tee just before the carburetor to connect the pressure gauge. I don't think the tee fitting exists. Numerous auto parts stores do not have the fitting. IS there another way to test a fuel pump?

Fuel pumps are not that expensive. It seems way easier to just change the pump. That is wasteful to me.