IMO, its pretty important to run a fuel pressure gauge. If anything would happen to your fuel system, an incar gauge will let you know immediately. I use the Autometer electric 100 psi gauge. I always find myself glancing at it, just to make sure everything is A-OK. The fuel system and fuel pressure is the life blood of the turbo motor. Keeping it monitored is pretty important, and aids in tuning, and trouble shooting. That alone is more than worth it to me...I think its even more important than a A/F gauge..the A/F gauge is very innacurat to tune with, since the stock o2 sensor cannot read a true "wide band" range of A/F mixtures. The most important gauge for me is the EGT. Then fuel, then oil pressure. Without the proper fuel and oil pressures, you have one big hunk of metal..I have seen too many times when guys just "set the fuel pressure and leave it", and end up with a blown motor..just because something happened to the fuel system or pressure..something that would easily been seen by a fuel pressure gauge..

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)