anyone have an air fuel ratio gauge?

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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.

Are you trying to self tune the car?