If you buy a cheap controller, relays and wiring for an oem amp pig fan, then the first thing you should buy is a fire extinguisher. Do it right the first time. Get a variable speed controller to control the high amp surge these oem electric fans have, get a heavy duty fuse holder for the maxi type fuses and buy yourself a soldering gun and solder and solder every wire terminal connection, don't just crimp, remove the plastic on the wire terminals before crimping and soldering.