Holley 558-128 Main Engine Harness for Ford 5.0L, 5.8L Fuel Injected Engines:

• Compatible with Holley EFI Dominator, HP, and Terminator X and X Max ECUs
• Plug and play ignition capability with Ford Dual Sync and HyperSpark Distributors
• Ignition adapter 558-305 (sold separately) is required for Ford TFI distributor use
• Comes pre-terminated for Ford PWM (pulse width modulated) idle air control (IAC) motors
• For use with OEM Ford fuel injectors, required injector harness 558-209 (sold separately)

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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