I've ordered some connectors for my Naomi from digikey so I can finally get it connected properly and had some difficulty finding the connectors for the namco pcbs that go with ninja assault.
This post is meant to help anyone who has a ninja assault kit but no wiring.
The Namco JYU pcb has a 12-pin rectangular header on it used to connect to the guns that looks just like an ATX style connector from Molex. But it isn't! The connector is made by Tyco Electronics, so when you do a manufacturer search in digikey, choose TE Connectivity.
The Namco Bass amp also has two connectors that look just like Molex style(mini-fit series) connectors, but they are actually TE Connectivity connectors as well. Although, I have found that a 6+2 PCI-E connector will fit. The 6 fits in the 6 and the +2 fits in the 2.