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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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Electrical and Wiring(343)
Emission Systems(164)
Engine Components(4639)
Exhaust System Parts(14804)
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Ignition System(1554)
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Wheels, Tires, and Parts(696)

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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)
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Keys(11)
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Wire Connectors(59)

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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

Terminator Stealth 2x4 MAIN HARNESS - 558-121

Sold out

Terminator Stealth 2x4 MAIN HARNESS - 558-121

Regular price $414.95 USD

Regular price Sale price $414.95 USD
Unit price per

Sold out
Dominator EFI GM Drive-By-Wire Harness - 558-406

Dominator EFI GM Drive-By-Wire Harness - 558-406

Regular price $205.15 USD

Regular price Sale price $205.15 USD
Unit price per
Pro-Jection E-Prom - 534-117

Pro-Jection E-Prom - 534-117

Regular price $137.95 USD

Regular price Sale price $137.95 USD
Unit price per
Holley EFI Ford Coyote Ti-VCT Sub Harness (2013-2017) - 558-125

Holley EFI Ford Coyote Ti-VCT Sub Harness (2013-2017) - 558-125

Regular price $363.95 USD

Regular price Sale price $363.95 USD
Unit price per
Main Power Harness - 558-308

Main Power Harness - 558-308

Regular price $81.68 USD

Regular price Sale price $81.68 USD
Unit price per
Tach Input Ignition Adapter - 558-302

Tach Input Ignition Adapter - 558-302

Regular price $21.71 USD

Regular price Sale price $21.71 USD
Unit price per
GM TPI and Stealth Ram EFI HARNESS KIT - 558-503

GM TPI and Stealth Ram EFI HARNESS KIT - 558-503

Regular price $798.95 USD

Regular price Sale price $798.95 USD
Unit price per
Holley EFI Gauge Module - 554-130

Holley EFI Gauge Module - 554-130

Regular price $124.15 USD

Regular price Sale price $124.15 USD
Unit price per
Holley EFI Ford Coyote Engine Main Harness w/ Ti-VCT & stock coil 11-17 -558-110

Holley EFI Ford Coyote Engine Main Harness w/ Ti-VCT & stock coil 11-17 -558-110

Regular price $708.95 USD

Regular price Sale price $708.95 USD
Unit price per
Gen III HEMI Main Harness , Late, w/TPS and Idle Air Control Connections 558-116

Gen III HEMI Main Harness , Late, w/TPS and Idle Air Control Connections 558-116

Regular price $661.95 USD

Regular price Sale price $661.95 USD
Unit price per
Ford 2V & 4V Modular Main Harness - 558-108

Ford 2V & 4V Modular Main Harness - 558-108

Regular price $750.95 USD

Regular price Sale price $750.95 USD
Unit price per
Gen III Hemi Main Harness Early w/ TPS and Idle Air Control Connections 558-115

Gen III Hemi Main Harness Early w/ TPS and Idle Air Control Connections 558-115

Regular price $774.95 USD

Regular price Sale price $774.95 USD
Unit price per
Dominator EFI GM Drive-By-Wire Harness - Early Truck - 558-429

Dominator EFI GM Drive-By-Wire Harness - Early Truck - 558-429

Regular price $223.15 USD

Regular price Sale price $223.15 USD
Unit price per
Dominator EFI GM Dual Drive-By-Wire Harness - 558-411

Dominator EFI GM Dual Drive-By-Wire Harness - 558-411

Regular price $338.95 USD

Regular price Sale price $338.95 USD
Unit price per
Universal MPFI Main Harness - 558-104

Universal MPFI Main Harness - 558-104

Regular price $437.95 USD

Regular price Sale price $437.95 USD
Unit price per
Pro-Dash Input/Output Harness - 558-456

Pro-Dash Input/Output Harness - 558-456

Regular price $229.45 USD

Regular price Sale price $229.45 USD
Unit price per

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