ok, Ender asked for a 4 wire grouping pic, took some time with an old PSU (its only 20 pin, thats why there's only 5 groups of 4 and not 6)
and before anyone goes OMG!!! those wires arnt in the right spots...no...I really DONT care about this PSU anymore (I dont even use it for a backup) so thats why I didnt put tons of care into doing the wiring of it, nor into doing a super super clean sleeve job, its mostly a proof of concept type
IIRC its 1/4in sleeve and 3/8th in heatshrink