Our cars have the narrow band O2s. I don't know if you are talking about one of those Autometer AFR gauges, but if you are don't waste your money. Save your money and get a wideband AFR with the gauge. I have the Innovative wideband LM-1 with rpm datalogging capabilities. I can connect an AFR gauge to the wideband plus I can datalog. They are easy to install. You will need to have a bung welded in the h-pipe or as an alternative I think some folks use one of the stock sensor locations for the wideband. I personally left the stock in place and had the bung welded into the pipe.
I have the Dyno jet wide band. Yes you have to weld up a bung. The dyno jet wide band has data logging capabilties, with 3 or 5 analog inuts, but I have not used them or datalogged any yet.
I have the same wide band setup as Methodical.. It works well, I do however want to hook it up to a perm gauge instead of relying on my laptop all the time..