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Holley 550-604 HP EFI ECU & Harness Kits made by Holley, for as low as $1873.99. Free shipping when your order includes this part. 4 Jul 2012 HP EFI Part #550-604 - Fuel Injector Harness Question The installation manual wiring instructions say the injector plugs are marked for Ford, Chevy and Dodge and to make sure Thought maybe I had the wrong harness. 17 Oct 2012 that modulator in distributor was bad so while taking distributor out I Also, what do you think about the upgrade 550-604 or the Dominator kit? USB-to-Serial adapter cable, be sure to follow the instructions to the letter. Buy Holley HP ECU and Harness Kit, Universal MPFI, with Bosch Sensor 550-604 from Views: 4588; Brand: Holley; Product Code: 550-604; Availability: In Stock Control based on time, gear, speend, and/or manual selection. Rating Bad Holley Black Sniper EFI Fuel Injection System Complete Master Kit. by Holley. In Stock . Holley 550-602 HP EFI, ECU and Harness Kit. by Holley The ease of installation and the self-tuning capability truly make this a carburetor killer. Its holley so how can you go wrong? . Holley 550-604 HP EFI, ECU and Harness Kit. Find Holley HP EFI ECU and Harness Kits 550-604 and get Free Shipping on Orders Over $99 at There are many variables that will affect your installation. WIRING MANUAL & DIAGRAMS 199R10555 HP EFI and Dominator EFI This manual contains Holley 550-604 Universal V8 HP EFI ECU & Harness Kit. . The unit is about $2500 including harness which is not too bad but more expensiveECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. Holley HP EFI systems are 1.0 Manual Overview . 2.0 ECU Installation, Connectors, and Pinout . the loose YELLOW (NOT yellow/black wire) in the harness to the negative side of the.