I used 22 gage stranded wire I got from radio $hack
I used red for the normally open terminals and green
for all the ground wires. This makes checking your wiring a lot easier. I conected everthing together with Quick Connects which I also bought at R$ I think these were
size .250 1/4" but take 1 of your micro switches with you to be sure. I also recomend grouping your wires in sections
for example : keep all of player 1's controls in a group and wire tie them together , keep the mame controls together and player 2 together. this allows for easy trouble shooting of wiring problems and removal of controls.
It's almost like building a wiring harness instead of just having wires running everywhere. I tied all the grounds from each group together and used a heavier wire from there to the I-Pac ground. This was definitely one of my favorite parts of building my cab. since my optipac and Ipac are mounted on the underside of my control panel ,once I got it wired I connected it up to my home pc and it was Game On! because of the dozens of hours I spent using it like this I almost didn't get my cab fiinished.
Good Luck
Slug54