Wanted - Air pressure gauge

[Greig Smith]

Looking for a small period gauge that will show air pressure, I am running a pressurized fuel tank in the new supercharged single seater and am looking for a suitable gauge which will show 5 to 8lbs of pressure in the fuel tank..... I don't really want to be guessing if I still have enough pressure on the hillclimb when the blower gets busy feeding the oily bits

All options and suggestions welcome !!

Regards 
Greig