I looked at the parts store today on lunch for a ac hose like pictured above, but no luck. I did find one of the yellow hoses from a broken ac manifold gauge set at work. I tested it on my fuel rail and it does not fit. The ac hose threads are too big.
However I got thinking, once I make this test gauge, my old one that has a mechanical gauge and a short hose on it becomes obsolete. I saw the exact same one at the parts store and realized it was not as expensive as I thought it was (bought it years ago). So I might just go ahead and sacrifice it to make my new one. The place I linked to above wanted $13 to ship a $17 part that would fit in the smallest padded envelope and ship for a buck or two.