This will be a good “how to” write up for connecting the AFR500, or NGK AFX to your Hptuners pro cable.
Yellow wire slot #1
Brown or black wire slot #5
For the power and ground wires I always prefer going to the battery or power/ground studs.
An easy way to connect the power and ground is using the dorman 85677 clips.
When not in use, to avoid draining your battery- do not allow the box to stay powered. You can unplug the main connector at the back of the box to kill the power when not in use.
I will attach some pics.