Help: how do you install 360s on official naomi mvc2 cabs?

whatsup guys, i have an arcade cab with marvel in it and its currently using an 8 way joystick. i just bought some 360s and im planning to put them in. i’ve built some sticks before on psx pads but not on an official machine. i have no clue how to find the 5v line that powers the 360s from the naomi console cabinet. anyone got anyclue what im suppose to be looking for, even yet anyone have any pictures?

Tap into the +5v line off of the powersupply.