> Let me give it a try.  The vacuum in the box would cause the gauge to read
> absolute pressure instead of psig (psi gauge).
> I think a fuel pressure gauge is probably over-kill.

Overkill? Ahhhh... I beleive a fuel pressure gauge is one of the main
diagnostic tools for the fuel injections system... certainly not
overkill.... how would you ever test fuel pressure without one?

If you run a
> mechanical set-up, you are risking a gas leak anywhere from the engine to
> the dash, and most electrical would not be accurate enough to see the
> difference between 29 and 34 psig  IMHO.

Oh but you're apparently not reading.... I said I wanted to install a
permanent fuel pressure in the engine compartment... never said anything
about running it to the dash or an electrical sender....

>I'd take the guage money and
> replace the regulator

A strange comment.... I guess you're assuming that the fuel regulator is the
only possible source of a fuel pressure problem... but it's not.... the
injectors, fuel pump check valve, and fuel pump itself are all possible
sources of the problem...

my thinking is why not have a permanent fuel pressure gauge rather than have
to relieve the pressure just to install the thing... a permanent fuel
pressure gauge and an digitool and you have most of the bases covered for
fuel injection diagnostics....

Bill