An inline fuel pressure gauge is nice to have to effortlessly verify everything's alright. How important is it? It's a good idea but not mandatory by any stretch. What I consider important to have with a pump that puts out 8psi max is an inline regulator. You want to be able to set the max pressure about 6psi for best performance. You will need a pressure gauge to verify the pressure you set is the pressure you want but after that you could disconnect the gauge and not worry about it unless you had a problem down the line.Update and another question....
I ordered my AFR gauge kit. Should be here this week.
Question - how important is it to have a fuel pressure gauge inline with the pump and carb? How important is it to have it. I'm currently running a summit fuel pump with max pressure 8psi and 110gph. Seems like a low cost "while I'm at it" that gives additional insight to performance and another touch point for troubleshooting. I think my carb is looking for 6'ish PSI which seems to set itself if you have the floats set correctly.
Fuel can push past the needle if pressure is too high overloading the bowls. I've never had a problem with it, but I do run a regulator and pressure gauge with a Carter 120gph pump. I don't remember max pressure for it, but it was similar to yours. Maybe it's overkill, but it works for me. Your setup is up to you.