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With the EZ-EFI harness connections made, you can fire up the handheld controller. It connects to the EZ-EFI computer, and gets power from any 12-volt accessory power source-in this case, the cigarette lighter. As you can see, the controller allows you to see trouble codes and live, real-time data. With the key in the "On" position, select Setup Wizard to educate the computer about your combination.