Wiring Harnesses

52 products

52 products
ON SALE
Kooks Headers 8in Front O2 Sensor Extension Kit - Chevrolet Camaro / SS 2010-2017
Kooks Headers 8in Front O2 Sensor Extension Kit - Chevrolet Camaro / SS 2010-2017
Kooks Headers
ON SALE
Kooks Headers O2 Sensor Extension Kit - Chrysler 5.7L / 6.1L / 6.4L HEMI 2005-2020
Kooks Headers O2 Sensor Extension Kit - Chrysler 5.7L / 6.1L / 6.4L HEMI 2005-2020
Kooks Headers
aFe MAF Sensor Harness Extension - 6in, 2019-2024 GM Trucks/SUVs
aFe MAF Sensor Harness Extension - 6in, 2019-2024 GM Trucks/SUVs
aFe
ON SALE
Radium Engineering 23in Fuel Pump Connector Harness - Porsche to Walbro 255
Radium Engineering 23in Fuel Pump Connector Harness - Porsche to Walbro 255
Radium Engineering
ON SALE
Radium Engineering Ring Terminal Insulator Boots - 5 Pack
Radium Engineering Ring Terminal Insulator Boots - 5 Pack
Radium Engineering
HKS V-Cam Crank Angle Sensor Kit - Nissan Skyline GT-R RB26DETT 1989-2002
HKS V-Cam Crank Angle Sensor Kit - Nissan Skyline GT-R RB26DETT 1989-2002
HKS
HKS Solid Cam Crank Angle Sensor Kit - Nissan Skyline GT-R RB26DETT 1989-2002
HKS Solid Cam Crank Angle Sensor Kit - Nissan Skyline GT-R RB26DETT 1989-2002
HKS
ON SALE
Kooks 5.7L HEMI O2 Sensor Extension Harnesses - Ram 1500 / Durango / Grand Cherokee 2007-2018
Kooks 5.7L HEMI O2 Sensor Extension Harnesses - Ram 1500 / Durango / Grand Cherokee 2007-2018
Kooks Headers
ON SALE
AEM CD Carbon Dash 2-Button External Button Kit
AEM CD Carbon Dash 2-Button External Button Kit
AEM
Walbro Fuel Pump Wiring Harness - 94-686
Walbro Fuel Pump Wiring Harness - 94-686
Walbro
Walbro GSS Fuel Pump Replacement Wiring Harness - 94-615
Walbro GSS Fuel Pump Replacement Wiring Harness - 94-615
Walbro
Walbro E85 Fuel Pump Plug - 000107694/AA
Walbro E85 Fuel Pump Plug - 000107694/AA
Walbro
ON SALE
Radium Engineering Porsche Fuel Pump Connector Harness 17in - Walbro E85
Radium Engineering Porsche Fuel Pump Connector Harness 17in - Walbro E85
Radium Engineering
HKS Turbo Timer Harness - Universal
HKS Turbo Timer Harness - Universal
HKS
ON SALE
Kooks Front O2 Sensor Extension Harness 8in - Ford Mustang GT 2018+
Kooks Front O2 Sensor Extension Harness 8in - Ford Mustang GT 2018+
Kooks Headers
HKS Turbo Timer Harness - Nissan 240SX 89-98, 300ZX Twin Turbo 84-89
HKS Turbo Timer Harness - Nissan 240SX 89-98, 300ZX Twin Turbo 84-89
HKS
HKS Turbo Timer Harness - Mitsubishi Evo 8/9/10 2003-2009, Eclipse MT-6 1995-1999
HKS Turbo Timer Harness - Mitsubishi Evo 8/9/10 2003-2009, Eclipse MT-6 1995-1999
HKS
HKS Turbo Timer Harness - FTP-1
HKS Turbo Timer Harness - FTP-1
HKS
HKS Turbo Timer Harness - Nissan 200SX 84-88
HKS Turbo Timer Harness - Nissan 200SX 84-88
HKS
ON SALE
AEM Main Harness for X-Series Temperature Gauge 30-0302
AEM Main Harness for X-Series Temperature Gauge 30-0302
AEM
ON SALE
AEM Power Harness for X-Series 30-0300 Wideband Gauge
AEM Power Harness for X-Series 30-0300 Wideband Gauge
AEM
ON SALE
AEM Replacement Sensor Harness for Digital Wideband Gauge 30-4110
AEM Replacement Sensor Harness for Digital Wideband Gauge 30-4110
AEM
ON SALE
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1994-1997
Mishimoto Glow Plug Harness & Gasket Kit - Ford 7.3L Powerstroke 1994-1997
Mishimoto
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1993-1996
HKS Turbo Timer Harness - Toyota Supra Twin Turbo 1993-1996
HKS

Wiring Harnesses & Engine Wiring

Wiring harnesses carry electrical signals and power between the ECU, sensors, actuators, and accessories throughout the vehicle. From standalone engine management harnesses for swaps to replacement factory harnesses and auxiliary wiring kits, the right harness ensures clean, reliable electrical connections.

OneFastShop carries wiring harnesses including standalone engine harnesses, engine swap wiring kits, fuel injector harnesses, coil pack harnesses, auxiliary accessory wiring kits, and direct-fit replacement harnesses for popular engine platforms and swap applications.

Every wiring harness at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're wiring an engine swap, replacing a damaged factory harness, or adding a dedicated harness for aftermarket accessories, OneFastShop has the harness. Shop the full wiring harnesses collection today.
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