Brent is using the laptop to tune it. It has approx 25 pages of gauges and settings. The A/F is reading from the O2 sensor so is only as accurate as it is. The screens look quite impressive as all data is shown live on the screen.
I will have to read his manual to find out if it is closed loop. There were about twenty wires to hook up the complete unit. It controls the fuel pump as well.
I assume that it will have to go on the dyno to finish it off.