Hello
I just bought a cabinet last week end. It has a working 25" monitor, the control panel, the coins mech and the power supply. Other than that, it is empty, meaning there is no game inside.

I understand I have to buy a CPS-2 "A" Board and also a CPS-2 "B" Board, but I have a feeling I'm missing an harness though, could you help me find out what harness I'm missing ? Here are the pictures.
These three connectors are from the control panel. But I don't think it connect directly to a CPS-2 cartridge? :

These two connectors are from the power supply:

Other connectors next to the power supply. Don't know what it could be even though I didn't check it with a multi-meter yet:
This one I believe is for the sound (QSound). Does it connect directly to a CPS-2 Cartridge ? I don't know:

Another plug, next to the monitor isolation transformer.

This one, I know, it's a harness from the monitor:

finally some harness from above the coin mechs:

I do not think all these plugs connect directly to a CPS-2 cartridge A or B.
My question is: what harness I'm missing so I can plug this harness to all these wires to finally plug all this to a CPS-2 game ?
Thanks for your help !
