It plugs in between the APPS (throttle position sensor in real world terms) and the engine wiring harness. Slick piece and real easy to install-think it took me about 45 minutes to put mine on!
My controller is down on the left side of the knee bolster just above the emergency brake release. Works good for me-reach down, turn the high-idle off, and release the brake... . and away I go!
Gordon is a great guy who makes great products-you won't regret buying anything from him!
Jason