What A/F Gauge do you run

I guess you're askin me. The module is the controller for the O2 sensor. The O2 sensor plugs into the right side of the module in the photo, and the module has three separate cables coming out.

Two are 1/8 stereo phone jacks. These are communications cables, and you can "daisy chain" them to other sensors. If you only have one (me) you plug a terminator into one, and the other connects to the DB-9 serial port cable.

The other cable is "everything else, power, grounds, signal outputs.

The module is programmable for special outputs, but in my case I used the "standard" programming, and entered this data into the Holley software.

One output is 0-5V wideband

The other simulates narrow band output, and I believe can be programmed otherwise.