Any self-respecting parts store will sell a fuel pressure gauge. Autozone may even have one in their loaner tool program. Usually the gauge set runs about $40 but it is an invaluable that will pay off as the years go by.
You might talk to some of your buddies that work on cars and they may have something you can borrow.
BTW I'd worry about the vapor-lock issue when you get to that bridge.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
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