I'll second that...
I've got the DiPricol 0-30 PSI fuel pressure gauge, and would not go with anything less. Just my opinion, though. I don't care for the "pegged needle" either. Additionally, some guys have seen 16 or so PSI with a new lift pump, and many with an added pusher have seen even more. If you were going to stay stock, you could get by with the 0-15, but I would definitely go with the 30 pound gauge if adding a pusher.