The first gauge I bought was a 0-15, since I was mainly concerned about too low of a fuel pressure. I didn't really like the idea of a needle that was pegged or close to pegged most of the time, though. So, I bought an SPA digital fuel pressure/oil temp combo. They're a bit pricey, but they are fully programmable and have several nice features like low pressure/high temp warning lights and peak recall. Plus, they'll read any pressure my fuel system will generate (to the tenths) no matter what system I have installed. The oil temp sensor would be handy for the auto trans, too.
Dakota Digital and Nordskog also make nice digital FP gauges.