Fuel Injection Harness

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Holley EFI

For 1979 to 1993 Ford Mustangs when converting to Holley EFI ECU

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$1,094.95 $949.95

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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$168.95 $149.95

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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$172.95 $149.95

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

Includes VVT and Oil Pump Connectors on IGN1A Smart Coils

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$575.95 $499.95

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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$562.95 $499.95

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 LS2/LS3/LS7, 58X Crank Sensor, USCAR/ EV6 Injector

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$1,037.95 $899.95

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

Injector upgrade harness for Terminator Throttle Bodies.

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$287.95 $249.95

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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$224.95 $199.95

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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$979.95 $849.95

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

1999-2004 Ford Modular 2 Valve Harness Kit

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$1,743.95 $1,499.95

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

Evenly spaced Ford V8 Injector Harness for Jetronic "Bosch EV1" style Injectors

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$230.95 $199.95

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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$3,543.95 $3,149.95

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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$3,824.95 $3,399.95

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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$3,543.95 $3,149.95

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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$906.95 $786.95

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

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Holley EFI

Universal 4 Cylinder EV14 Injector Harness for HP EFI & Dominator EFI

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$138.95 $119.95

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 LS1/6, 24X Crank Sensor, Bosch Injector

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$1,153.95 $999.95

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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$345.95 $306.95

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 LS2/LS3/LS7, 58X Crank Sensor, Bosch Injector

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$1,094.95 $949.95

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

GM TPI and Stealth Ram EFI Harness Kit

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$979.95 $849.95

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

Evenly spaced Ford V8 Injector Harness for USCAR / EV6 style Injectors

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$224.95 $194.95

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

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Holley EFI

NEW DEVICE TO TWO PIN MAIN HARNESS

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$48.40 $41.97

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

LS MULTEC 2 INJECTOR HARNESS - EARLY TRUCK

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$316.95 $274.95

LS MULTEC 2 INJECTOR HARNESS - EARLY TRUCK

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Holley EFI

Plug and Play with Dominator ECU

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$359.95 $312.95

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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$922.95 $799.95

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 - GM 4L60 (Pre-2009) and 4L80

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$345.95 $299.95

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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$310.95 $269.95

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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$979.95 $849.95

This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI engine with an aftermarket cable actuated throttle body. It is meant...

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Holley EFI

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

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$205.95 $178.95

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

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Holley EFI

Universal 6 Cylinder Injector Harness for HP EFI & Dominator EFI

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$245.95 $212.95

Universal 6 Cylinder Injector Harness for HP EFI & Dominator EFI

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Holley EFI

Universal Unterminated Injector Harness

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$259.95 $226.15

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

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Holley EFI

2011-2017 Ford Coyote Drive-By-Wire Harness

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$317.95 $275.95

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

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Holley EFI

Ford V8 Injector Harness for HP EFI & Dominator EFI

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$287.95 $255.95

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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$215.95 $191.95

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...