If you are wiring for an arcade pc board that is jamma compatible then your best bet is to buy a jamma harness. That way you will have lots of cclor coded and sometimes labeled wire (depends on what you buy) that you can install in your cab. This saves you the time and effort of recreating a jamma harness from individual wires. Bob Roberts sells harnesses and connectors.
You will also have multiple power wires to safely carry the requred power from the PS to the jamma board.