i used the wires from the stock headlamp setup on the 92 so it should be overkill for these lights. pretty heavy guage much heavier than the wiring that came with the lights.
the wire from relay to switch does not need to be a heavy guage cause the current (for the lights)does not flow through the switch. the switch only turns the heavy current of the lights on when grounded and off when ungrounded.
not sure if the fuse is heavy enough but the headlights run a 10amp for each headlight and these are smaller lights so i figured a 15amp should do it they work great and im not getting any heat and haven't blown the fuse.