The A/F gauge is really just a show. There is very little "good" information to be gathered from it. It is neat, I have one.
Boost/Vac (Definitely)
Water Temp in Degrees (had to as I killed my stock sender)
A/F
Those are the gauges that I am running.
Where did you get a 2-gauge pillar pod? I got my 3-pod from Lo-Tek as I thought that it was the only one made. It almost matches too!