If you're looking for one of these gauges for a Comp 289 or FIA/USRRC build, saw this on eBay...
NOSTALGIC VINTAGE STEWART WARNER 2 5/8 FUEL PRESSURE GAUGE DRAG RACE ROD STREET | eBay
These (0-10psi) are hard to find, and it's dirt cheap
Cheers
Glen
edit: I should add that I'm not selling it; I just happened to see it and I know too well how rare they are.