Harry,
It depends on where you put the gauge.
With EFI you will likely run a fuel pressure regulator. The gauge is normally hooked up at the injector side of regulator. So in your case, the reading will show the normal fuel pressure and the boost referenced pressure combined.
So if running a TBI unit with 22 PSI (guess) and then add 10 PSI boost . The fuel pressure regulator will add 10 PSI to the fuel for a combined 32 PSI. So your fuel pump must be capable of supplying the combined 32 PSI at a volume high enough to feed the engines demand.