So I've looked fairly thoroughly through a lot of posts on this forum trying to figure out the correct boundary conditions for finding the static pressure drop, as well as velocity and flow distributions.

As seen below, with a static pressure boundary at the inlet and a mass flow at the outlet, it doesn't show any pressure change, the velocity is the same as well, no change over the flow.

Can anyone offer some advice?

Looking a little deeper, I do see a very small difference in pressure, is there a way to display the pressure on the scale to more accuracy?