What A/F Gauge do you run

I'm installing this same unit as we speak :) Quick question about the bung placement. How far down the exhaust tube should this be placed? I'm a little tight for space and i'm planning on welding it (10degrees above centerline) on the passenger side towards the end of the transmission. Is this too far?

Way too far. You will not get an accurate reading and the sensor will most likely not get hot enough. I have the same one. Somewhere near the merge collector if possible. On my turbo motor I mounted 2 bungs, 1 on each side about 18" away from the turbos on the down pipes.