for the fuel pressure I would get the electric so that i could
run it into the cabin. However It hought about it,and I may just put one on the rail. I was looking at the AutoMeter Phantom gauges. I like the white face and they have alot of options with that line of gauge, including the D-PIC gauge.
http://egauges.com/vdo_mult3.asp?Type=Dpic&Series=Phantom&Units=E
Kind of like the G-TECH but you don't stick it on the windshield.
As far as the A/F gauge goes, is a narrow band even worth getting or just spend the extra $200+ and get the wideband.