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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)
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EFI Wires and Harnesses (69 products)

EFI Wires and Harnesses (69 products)

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AC and Heat(213)
Air and Fuel Delivery(5779)
Brake Parts(5427)
Charging and Starting Systems(148)
Cooling Systems(728)
Electrical and Wiring(321)
Emission Systems(163)
Engine Components(4080)
Exhaust System Parts(13795)
Exterior Body Parts(1735)
Fittings and Hoses(1747)
Ignition System(1456)
Interior Body Parts(1454)
Lighting and Lamps(537)
Performance Upgrades(1103)
Steering and Suspension Parts(1837)
Tools, Equipment, and Chemicals(203)
Transmission and Drivetrain(3539)
Wheels, Tires, and Parts(215)

Electrical and Wiring Sub-Categories

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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(71)
Wire Connectors(47)

Drivetrain

Search

4x4
All Wheel Drive
Rear Wheel Drive

Cab Type

Search

Reg Cab
Ext Cab
Crew Cab or Quad Cab

Bed Size

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Short Bed
Long Bed

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Holley
Holley Sniper
HolleyEFI

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EFI Wires and Harnesses (69 products)

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69 products

LS1/6 (24x/1x) Engine Main Harness - 558-102

LS1/6 (24x/1x) Engine Main Harness - 558-102

Regular price $783.00 CAD

Regular price Sale price $783.00 CAD
Unit price per
Ls1/6 Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-133

Ls1/6 Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-133

Regular price $726.00 CAD

Regular price Sale price $726.00 CAD
Unit price per
Ls2/3/7+ Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-134

Ls2/3/7+ Engine Main Harness, Extended Length For Hp Efi & Dominator Efi-558-134

Regular price $726.00 CAD

Regular price Sale price $726.00 CAD
Unit price per
Sniper EFI Input/Output Harness - 558-491

Sniper EFI Input/Output Harness - 558-491

Regular price $79.00 CAD

Regular price Sale price $79.00 CAD
Unit price per
Holley Sniper EFI 558-490 Sniper EFI Main Harness

Holley Sniper EFI 558-490 Sniper EFI Main Harness

Regular price $200.00 CAD

Regular price Sale price $200.00 CAD
Unit price per
CAN EXTENSION HARNESS, 8FT - 558-425

CAN EXTENSION HARNESS, 8FT - 558-425

Regular price $72.00 CAD

Regular price Sale price $72.00 CAD
Unit price per
GEN III HEMI VVT Harness Only - 558-131

GEN III HEMI VVT Harness Only - 558-131

Regular price $143.00 CAD

Regular price Sale price $143.00 CAD
Unit price per
CAN Adapter Harness, 12' - 558-454

CAN Adapter Harness, 12' - 558-454

Regular price $100.00 CAD

Regular price Sale price $100.00 CAD
Unit price per
CAN EXTENSION HARNESS, 4FT - 558-424

Sold out

CAN EXTENSION HARNESS, 4FT - 558-424

Regular price $64.00 CAD

Regular price Sale price $64.00 CAD
Unit price per

Sold out
Digital Dash I/O Adapter w/Unterminated Vehicle Harness - 558-433

Digital Dash I/O Adapter w/Unterminated Vehicle Harness - 558-433

Regular price $371.00 CAD

Regular price Sale price $371.00 CAD
Unit price per
Dominator EFI Auxiliary Harness - 558-402

Dominator EFI Auxiliary Harness - 558-402

Regular price $200.00 CAD

Regular price Sale price $200.00 CAD
Unit price per
CAN Adapter Harness, 4' - 558-452

CAN Adapter Harness, 4' - 558-452

Regular price $57.00 CAD

Regular price Sale price $57.00 CAD
Unit price per
Universal Coil On/Near Plug Harness - 558-307

Universal Coil On/Near Plug Harness - 558-307

Regular price $214.00 CAD

Regular price Sale price $214.00 CAD
Unit price per
HOLLEY EFI 100FT CABLE, 7 CONDUCTOR - 572-101

HOLLEY EFI 100FT CABLE, 7 CONDUCTOR - 572-101

Regular price $284.00 CAD

Regular price Sale price $284.00 CAD
Unit price per
CAN Adapter Harness, 8' - 558-453

CAN Adapter Harness, 8' - 558-453

Regular price $72.00 CAD

Regular price Sale price $72.00 CAD
Unit price per
GEN III HEMI VVT and SRV Harness - 558-132

GEN III HEMI VVT and SRV Harness - 558-132

Regular price $186.00 CAD

Regular price Sale price $186.00 CAD
Unit price per

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