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First, you need to disconnect the negative battery cable. The Jet installation instructions will tell you where the stock ECU is located on your vehicle. In the case of our '97 Wrangler, it was located under a snap-on dust cover on the firewall. After locating your ECU, simply remove the stock ECU connector and plug the Jet module into the stock connector, making sure the module is installed tightly on the stock connector. Some applications will require removal of a dust cover, and this will not reinstall without modifications. Start the vehicle and verify that the "check engine" light is not on and everything is working properly. It's that simple!