Ls2 cooling fan question

[fillpot]

Guy's got a 69 Camaro with a ls2 out of a trailblazer SS, quick question, redoing some wiring and had the fans hooked up on keyed power and would like to run them with the pcm, now speartech reworked my harness and I don't remember there being a labeled wire or plug etc for this(the car has been running for like year) the fans work fine hooked up to the keyed power but just wanted to run them off the computer, and ideas? THANKS!