An Electronic Control Unit (ECU) Wiring Patch Harness is a short electrical harness that is installed between a vehicles ECU and its wiring. All Autosport Wiring Patch harnesses use the Original Equipment Manufacture (OEM) connectors, plugs and contacts to allow it to plug easily into place. With this harness, late model cars can now have electronic mods wired safely and easily into it at a workbench, without having to cut into and possibly damage the factory wiring harness. No more standing on your head to do underdash wiring mods! Also allows you to return the car to stock, without any signs of tampering with the stock ECU wiring harness.

Quote from off the website. New they sell for 300 + shipping, mine is used but still in perfect condition, make me an offer.