A/F ratio guage?Whats the best for an02'?Also...

I searched for some info on A/F ratio guages on the forum and basically it was people talking about how theirs didn't work. Products
This zeitronix guage was recommended and it seems to come with a windows interface. It is a wideband sensor which seems to be the way to go. This one seems like it will go well with the revo software and tuner that is on order with my garret gt2871r. What i'm getting at is, will this work with my test pipe i ordered and what seems to be the most popular/effective option in regulating/monitoring my a/f ratio?
Also will my stage3 southbend clutch hold up to the soon-to-be added horsepower, or should i order a better rated pressure plate?
Current mods:
-APR Stage1+ Chip tuning
-Audi 225Hp TT injectors
-Forge Hybrid D-BOV
-ECS Sport Rotors W/greenstuff pads
-Neuspeed cat-back exhaust
-Neuspeed Short-throw shifter
-Iridium Plugs
-Southbend Stage3 Clutch
-Custom FMIC
(IN route/To be Installed within the next 2weeks):
-Garret GT2871R Turbo
-APR High-Flow manifold
-440cc green-top injectors
-APR test pipe
-Revo software
-Revo select+ tuner w/windows software
-APR Turbo inlet pipe
What else would you guys throw onto this list of upgrades if you were throwing these on your Audi?