Fuel Injection Harness

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Holley EFI

Holley EFI Harness Kit - Ford Foxbody 5.0L V8 W/Tfi

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$1,124.95 $1,068.70

This harness is for fuel injected small block ford engines such as 5.0L or 5.8L Windsor powerplants. Plug and play ignition capability with Dual...

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Holley EFI

Holley EFI GM GEN V GDI Sub Harness

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$175.95 $167.15

GM GEN V GDI Sub harness for Late LTx Engines. The fuel pressure sensor easily identifies these engines, Late engines use a 3-pin fuel...

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Holley EFI

Holley EFI GM GEN V GDI Sub Harness

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$178.95 $170.00

GM GEN V GDI Sub harness for early LTx Engines. The fuel pressure sensor easily identifies these engines, early engines use a 4-pin fuel...

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Holley EFI

Ford 7.3L Godzilla Main Harness for Smart Coils

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$598.95 $569.00

The Terminator X offers an advanced engine management solution specifically tailored for the formidable 7.3-liter Godzilla engine. Designed to unlock the full potential of...

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Holley EFI

Ford 7.3L Godzilla Main Harness for Stock Coils

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$584.95 $555.70

The Terminator X offers an advanced engine management solution specifically tailored for the formidable 7.3-liter Godzilla engine. Designed to unlock the full potential of...

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Holley EFI

GM 58X EFI HARNESS KIT

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$1,068.95 $1,015.50

An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important...

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Holley EFI

Terminator Throttle Body Harness

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$299.95 $284.95

Injector upgrade harness for Terminator Throttle Body Systems. This harness is designed to be plug and play with our 205 lb/hr injector upgrade kit,...

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Holley EFI

Gen III HEMI V8 Injector Harness - Stock/USCAR style injectors

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$233.95 $222.25

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory...

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Holley EFI

Universal V8 MPFI EFI Harness Kit

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$1,012.95 $962.30

An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important...

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Holley EFI

Ford Modular 2 Valve EFI Harness Kit

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$1,799.95 $1,709.95

This wiring harness interfaces a Holley EFI ECU to a 2V Modular Ford engine. It is meant to be used in conjunction with an...

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Holley EFI

Ford V8 Injector Harness

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$239.95 $227.95

Ford V8 Injector Harness for Jetronic "Bosch" style Fuel Injectors (Evenly Spaced)

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Holley EFI

HP EFI ECU & Harness Kits

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$3,712.95 $3,527.30

Looking for a plug and play kit for your Ford Modular engine? The HP ECU allows you to accurately control the fuel and ignition...

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Holley EFI

HP EFI ECU and Harness Kits

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$3,993.95 $3,794.25

Looking for a plug and play kit for your Ford Modular engine? The HP ECU allows you to accurately control the fuel and ignition...

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Holley EFI

HP EFI ECU and Harness Kits

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$3,712.95 $3,527.30

Looking for a plug and play kit for your Ford Modular engine? The HP ECU allows you to accurately control the fuel and ignition...

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Holley EFI

Universal Ford V8 Harness Kit

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$956.95 $909.10

Universal Ford V8 Harness Kit for Holley HP and Dominator ECU's

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Holley EFI

Universal 4 EV14 Cylinder Injector Harness

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$142.95 $135.80

This Universal 4 Cylinder EV14 Injector Harness is designed to be plug and play with HP EFI & Dominator EFI Systems, utilizing our 205...

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Holley EFI

GM LS 24X EFI HARNESS KIT

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$1,199.95 $1,139.95

An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important...

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Holley EFI

Unterminated 16 Injectors MPFI Harness

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$358.95 $341.00

Unterminated 16 injectors MPFI harness Terminated at injector connectors (Bosch style). Harness must be assembled and require crimping Metripak150 connectors. Includes all connectors, pins,...

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Holley EFI

GM LS 58X EFI HARNESS KIT

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$1,124.95 $1,068.70

An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important...

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Holley EFI

GM TPI and Stealth Ram EFI Harness Kit

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$1,012.95 $962.30

An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important...

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Holley EFI

Ford V8 Injector Harness

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$233.95 $222.25

Ford V8 Injector Harness for Ford USCAR / EV6 style Fuel Injectors (Evenly Spaced)

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Holley EFI

CAN Adapter/Power Harness

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$50.33 $47.81

The Holley EFI Can Adapter/Power Harness adapts two pin Holley main harness CAN connectors to new style 4 pin CAN devices.

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Holley EFI

INJECTOR HARNESS - EARLY TRUCK

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$328.95 $312.50

MULTEC 2 INJECTOR HARNESS - EARLY TRUCK

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Holley EFI

Injector Driver Harness

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$373.95 $355.25

The Holley EFI Injector Driver Harness comes pre-terminated with a J2B connector, for plug and play connectivity with your Dominator ECU. This harness is...

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Holley EFI

Gen III HEMI Main Harness Late w/ TPS and Idle Air Control Connections

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$956.95 $909.10

Gen III HEMI Harness with TPS and Idle Air Control Connections. This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI...

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Holley EFI

Holley EFI Transmission Control Harness - For 1996-2008 GM 4L60E and 4L80E

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$358.95 $341.00

Expanding our transmission control options for our EFI systems, this harness provides plug and play for Pre-2009 GM 4L60 and 4L80 transmissions using a...

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Holley EFI

Holley EFI GM Drive-By-Wire Harness - Early Truck

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$321.95 $305.85

Terminator X Max and Dominator EFI GM DBW Harness-Early Truck. Compatible with GM part number 10379038.

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Holley EFI

Gen III Hemi Main Harness Early w/ TPS and Idle Air Control Connections

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$1,012.95 $962.30

Gen III HEMI Harness with TPS and Idle Air Control Connections. This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI...

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Holley EFI

LSx Injector Harness - For EV6 Style Injectors

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$213.95 $203.25

LSx Injector Harness for HP EFI, Dominator EFI and Terminator X.

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Holley EFI

Universal 6 Cylinder Injector Harness

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$254.95 $242.20

Universal 6 Cylinder Injector Harness for HP EFI & Dominator EFI

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Holley EFI

Universal Unterminated Injector Harness

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$269.95 $256.45

Universal Unterminated Injector Harness for HP EFI & Dominator EFI(Bosch EV1 style).

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Holley EFI

Ford Coyote Drive-By-Wire Harness

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$337.95 $321.05

Drive-By-Wire harness for 2011-2017 Ford Coyote (5.0L) engines

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Holley EFI

Ford V8 Injector Harness

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$299.95 $284.95

Ford V8 Injector Harness for HP EFI & Dominator EFI

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Holley EFI

Gen III HEMI V8 Injector Harness - Bosch/Jetronic and Holley injectors

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$224.95 $213.70

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory...