Wire Harnesses
EFI Connection Harnesses
Our own stand-alone, plug and play, and custom engine harnesses for Holley EFI systems are a value difficult to match. With production tooling, ultrasonic splices, genuine components, and wire color correct construction, you'll have no issues using our products with other Holley brand components.
- EFI Connection 24x/58x LT1 Stand-Alone Engine Wire Harness for Holley EFI ECU
- EFI Connection 24x/58x SBC Stand-Alone Engine Wire Harness for Holley EFI ECU
- 1993-1997 Camaro Firebird Direct Fit Engine Harness for Holley Terminator X, HP, Terminator X Max, or Dominator ECU
- 1993-1997 Camaro Firebird Bare Bones Harness Minus Fuel Injection
Adapter & Extension Harnesses
Make quick work of installing your Holley engine harness by using our sensor adapter and extension harnesses. These harnesses make Holley's universal main harnesses application specific.
- Male to Male Four Wire CAN Bus Adapter Harness for Holley EFI Systems
- Oil and Fuel Pressure Sensor Extension Harness 24 inches
- Coolant Temperature Sensor Extension Harness 18 inches for GM TPI LT1 LS-Series
- Idle Air Control Valve IAC - 85-92 TPI and 92-93 LT1 to Holley 558-102 Main Harness
- MAP Adapter Harness - 92-97 LT1 to Holley 558-102 Main Harness
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Male to Male Four Wire CAN Bus Adapter Harness for Holley EFI Systems -
Oil and Fuel Pressure Sensor Extension Harness 24 inches -
TPS Adapter Harness - 92-97 LT1 TPS to Holley 558-102 Main Harness -
CKP Adapter Harness - 96-97 LT1 CKP to Holley 558-102 Main Harness -
CMP Adapter Harness - Gen IV LS-Series to Holley 558-102 Main Harness -
Knock KS Adapter Harness - SBC LT1 to Holley 558-102 Main Harness -
MAP Adapter Harness - 92-97 LT1 to Holley 558-102 Main Harness -
Idle Air Control Valve IAC - 85-92 TPI and 92-93 LT1 to Holley 558-102 Main Harness -
Coolant Temperature Sensor Extension Harness 18 inches for GM TPI LT1 LS-Series -
Holley® Main Power Harness for HP, Dominator, Terminator X, Terminator X Max ECUs -
Holley® LS1/6 (24X/1X) Engine Main Harness -
Holley® LS2/3/7+ (58X/4X) Engine Main Harness -
Holley® EV1 V8 Over Manifold, Bosch Style Injector Harness -
Holley® LSX Injector Harness - for EV6 Style Injectors -
Holley® Injector Harness - Early Truck -
Holley® GM 4L60/80E Transmission Harness -
Holley EFI Terminator X Max Transmission Kit - GM 6L80/90 -
EFI Connection 24x/58x SBC Stand-Alone Engine Wire Harness for Holley EFI ECU -
EFI Connection 24x/58x LT1 Stand-Alone Engine Wire Harness for Holley EFI ECU -
1993-1997 Camaro Firebird Direct Fit Engine Harness for Holley Terminator X, HP, Terminator X Max, or Dominator ECU -
1993-1997 Camaro Firebird Bare Bones Harness Minus Fuel Injection
