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Collection: EFI Wires and Harnesses

Wanting to go full-custom on your next fuel injection conversion? Here at Modern Day we offer wiring, harnesses, and much more to allow you to make the EFI set-up you've been waiting for!

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4WD Switches(1)
Back Up Light Switch(10)
Brake Light Switches(10)
Cable Ties(2)
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Data Acquisition Components(19)
EFI Wires and Harnesses(69)
Electrical Switches(7)
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Holley
Holley Sniper
HolleyEFI

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EFI Wires and Harnesses (69 products)

EFI Wires and Harnesses (69 products)

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69 products

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AC and Heat(285)
Air and Fuel Delivery(6347)
Brake Parts(7667)
Charging and Starting Systems(176)
Cooling Systems(1068)
Electrical and Wiring(343)
Emission Systems(164)
Engine Components(4639)
Exhaust System Parts(14804)
Exterior Body Parts(5386)
Fittings and Hoses(1757)
Ignition System(1554)
Interior Body Parts(3961)
Lighting and Lamps(2560)
Performance Upgrades(1140)
Steering and Suspension Parts(5848)
Tools, Equipment, and Chemicals(393)
Transmission and Drivetrain(3716)
Wheels, Tires, and Parts(696)

Electrical and Wiring Sub-Categories

Search

4WD Switches(1)
Back Up Light Switch(10)
Brake Light Switches(10)
Cable Ties(2)
Cruise Control Buttons(1)
Data Acquisition Components(19)
EFI Wires and Harnesses(69)
Electrical Switches(7)
Fuses(26)
Key Fobs(6)
Keys(11)
Neutral Safety Switches(5)
Oil Pressure Sending Units(20)
Relays(16)
Sensors(81)
Wire Connectors(59)

Drivetrain

Search

4x4
All Wheel Drive
Rear Wheel Drive

Cab Type

Search

Reg Cab
Ext Cab
Crew Cab or Quad Cab

Bed Size

Search

Short Bed
Long Bed

Brand

Search

Holley
Holley Sniper
HolleyEFI

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In stock (64 products)
Out of stock (5 products)

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69 products

CAN ADAPTER/POWER HARNESS - 558-430

CAN ADAPTER/POWER HARNESS - 558-430

Regular price $38.50 USD

Regular price Sale price $38.50 USD
Unit price per
Sealed USB Data Cable - 558-438

Sealed USB Data Cable - 558-438

Regular price $121.95 USD

Regular price Sale price $121.95 USD
Unit price per
Unterminated 16 injectors MPFI harness - 558-207

Unterminated 16 injectors MPFI harness - 558-207

Regular price $279.95 USD

Regular price Sale price $279.95 USD
Unit price per
Dominator EFI Auxiliary Harness - 558-403

Dominator EFI Auxiliary Harness - 558-403

Regular price $161.95 USD

Regular price Sale price $161.95 USD
Unit price per
HolleyEFI Ford Coyote Ti-VCT Main Harness for HolleyEFI HP smart coils - 558-122

HolleyEFI Ford Coyote Ti-VCT Main Harness for HolleyEFI HP smart coils - 558-122

Regular price $773.95 USD

Regular price Sale price $773.95 USD
Unit price per
Unterminated 15' Flying Lead Main Harness - 558-126

Unterminated 15' Flying Lead Main Harness - 558-126

Regular price $351.95 USD

Regular price Sale price $351.95 USD
Unit price per
Universal MPFI Coil on Plug Main Harness - 558-117

Universal MPFI Coil on Plug Main Harness - 558-117

Regular price $507.95 USD

Regular price Sale price $507.95 USD
Unit price per
Four Channel Coil Driver Module - 554-123

Four Channel Coil Driver Module - 554-123

Regular price $150.95 USD

Regular price Sale price $150.95 USD
Unit price per
Universal V8 MPFI EFI HARNESS KIT - 558-504

Universal V8 MPFI EFI HARNESS KIT - 558-504

Regular price $719.95 USD

Regular price Sale price $719.95 USD
Unit price per
Ford 2V Modular Coil Harness - 558-314

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Ford 2V Modular Coil Harness - 558-314

Regular price $212.95 USD

Regular price Sale price $212.95 USD
Unit price per

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Unterminated Universal Main Harness - 558-105

Unterminated Universal Main Harness - 558-105

Regular price $437.95 USD

Regular price Sale price $437.95 USD
Unit price per
Dominator EFI Auxiliary Harness - 558-404

Dominator EFI Auxiliary Harness - 558-404

Regular price $186.25 USD

Regular price Sale price $186.25 USD
Unit price per
CAN EXTENSION HARNESS, 12FT - 558-426

CAN EXTENSION HARNESS, 12FT - 558-426

Regular price $72.51 USD

Regular price Sale price $72.51 USD
Unit price per
Ford Coyote (2011-2017) Drive-By-Wire Harness - 558-422

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Ford Coyote (2011-2017) Drive-By-Wire Harness - 558-422

Regular price $253.95 USD

Regular price Sale price $253.95 USD
Unit price per

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Digital Dash I/O Adapter w/Terminated Vehicle Harness - 558-434

Digital Dash I/O Adapter w/Terminated Vehicle Harness - 558-434

Regular price $327.55 USD

Regular price Sale price $327.55 USD
Unit price per
Dominator EFI Auxiliary Harness - 558-401

Dominator EFI Auxiliary Harness - 558-401

Regular price $189.85 USD

Regular price Sale price $189.85 USD
Unit price per

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