I plan on supercharging the mustang. I know that I need a fuel pressure gauge and a boost/vac gauge. Do you guys that have Air/Fuel Ratio gauges think they are worth it? Are there wideband ones available? I'm looking at the AutoMeter Cobalt one:

AutoMeter A/F Gauge

Is there a better one I should look at? Can this information be obtain from the OBD-II port? Will I use it after I am done tuning? Thanks for the info.

Jon