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Direct replacement for original factory harness, designed for full compatibility with Holley EFI series systems, ensuring perfect fit and stable communication with vehicle engine management systems Y-splitter design enables simultaneous connection of multiple devices such as handheld programmers and laptops to the EFI system, for convenient real-time data monitoring and system operation Features a shielded wire structure to enhance signal stability, reduce electromagnetic interference, and ensure reliable and consistent data transmission in complex automotive electrical environments Matches the original vehicle interface perfectly, no modification or special tools required, enables quick harness replacement and simplifies ECU firmware update operations for vehicle tuning Made of durable materials with stable electrical performance, suitable for long-term use in automotive modification, engine tuning, and daily vehicle electrical system maintenance scenarios