Can I use the stock Galaga wiring harness if i choose to run a 60-1 with the jamma adapter from jamaboards.com? or would I need a different wiring harness as well?
You need a 4 ways joystick and add 2 wires (up,down) and add 2nd button to play all of games 60 in one.You maybe better off just rewire it jamma.
If you only want to play games use 2 ways joystick ,you don't have to add anything.
If you use original PS,you may want to check the voltage,make sure it is +5.1v.