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[HANDHELD] To fire the EFI system and get the 383 running, we connected the communications cable that links the handheld with the main wiring harness. Since the EZ-EFI handheld serves as the user interface with the EZ-EFI system, you’ll need to answer a few questions during the setup. The good news is the handheld system uses a simple menu system that offers advanced features without requiring a laptop or any computer skills. Once the Setup Wizard tasks have been completed, the engine can be fired up. It also serves as a scan tool by displaying live data and diagnostic information. Beyond the basic setup and scanning functions, it offers the ability to adjust other settings to suit the engine, including the rev limiter and target air/fuel ratios.