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New Year Sale Holley Efi Main Harness,ls2/3/7+,58x,4x,extended Summer Must-have [tlnfjbmp]

$56.99 $182.99 -69%

Holley EFI Main Harness for LS2/3/7+ Engines The Holley EFI Main Harness is a premium accessory designed for LS2/3/7+ engines, offering an extended length and compatibility with a range of Holley ECUs. This harness is the ideal solution for installer

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New Year Sale Holley Efi Main Harness,ls2/3/7+,58x,4x,extended Summer Must-have [tlnfjbmp]

Holley EFI Main Harness for LS2/3/7+ Engines

The Holley EFI Main Harness is a premium accessory designed for LS2/3/7+ engines, offering an extended length and compatibility with a range of Holley ECUs. This harness is the ideal solution for installers seeking to mount their Holley EFI ECU within the passenger compartment, ensuring easy access and protection from the elements. Its plug-and-play design guarantees a seamless installation process, while its extended length provides flexibility for various mounting locations.

Technical Specifications and Features

Engineered with precision, this main harness is compatible with both 24X and 58X LS engines from 1997 to 2012. It features a 58X crank reluctor and is specifically designed for LSX applications. Key features include plug-and-play compatibility with Dominator, HP, Terminator X, and Terminator X Max ECUs, making it a versatile choice for a wide range of vehicles. The extended length allows for versatile mounting options, such as on a roll bar or under the passenger seat, ensuring maximum convenience and ease of access.

Practical Applications and Benefits

The Holley EFI Main Harness is not just a technical component; it's a practical solution for enhancing the performance and convenience of your vehicle. Its compatibility with various Holley ECUs ensures that it can be used in a wide range of applications, from street rods to off-road vehicles. By allowing the ECU to be mounted inside the passenger compartment, it not only protects the unit from the elements but also makes it easier to monitor and adjust. This harness is perfect for both DIY enthusiasts and professional installers looking to upgrade their LS2/3/7+ engines with the latest Holley EFI technology.

What Our Customers Say

February 5, 2026

Absolutely no complaints!

An excellent item. It is very handy.

- Ewart N..

February 5, 2026

Absolutely no complaints!

An excellent product. Very powerful.

- Berenger K..

February 5, 2026

Absolutely no complaints!

A great product that is very clever.

- Orlaith J..

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