I will be installing an XFI and eventually dual fans. Will I be able to purchase a dual fan harness from Caspers or Racetronix and plug into stock wiring system? Or do I need to purchase a dual fan harness that I will need to run to a Aux output on the XFI? would rather just connect to stock wiring system with the plug-n-play harnesses made by Caspers or Racetronix.