I just got a Sports Shooting USA cabinet in yesterday. I have 0 knowledge of the wiring configuration but this is what the connections for the Happ guns look like in my control panel. If you need better pictures please let me know.
Here some pics of my setup.
Pinout of the loom is in the last pic. I drew the connector just lik you see it in the first pic.
The numbers are the pin numbers of the connector on the gun board.
The hap gun connects to cn2 for player on and cn4 for player two. The red wire shoud go to pin 1.