SMG Universal LS/LT Flex Harness

SMG Flex Fuel Sensor Wiring Harness – LS/LT Applications

SMG’s Flex Fuel Harnesses make adding a flex fuel sensor to your LS or LT build simple, clean, and reliable. Designed for straightforward installation and dependable operation, this harness is built with the same high-quality materials we use in our in-house performance builds.

Engineered for LS & LT Platforms
Compatible with most LS- and LT-based engines, this harness is the ideal solution for adding flex fuel capability to both street and race applications.

Smart Power & Simple Install

• Proven ignition coil jumper power source – avoids cutting into factory wiring while delivering stable voltage.

• PCM disconnect lead allows quick, clean connection to the ECM without back-probing or splicing.

• Fully sleeved in abrasion-resistant braided loom to protect against heat, vibration, and engine bay wear.

• Designed for OEM-like fit and finish with professional-grade terminals and seals.

PCM signal-wire connection: Download the SMG Flex Fuel PCM Pinout Guide V5.0 (PDF). Identify your installed controller and connector before pinning; coverage and calibration requirements are listed in the guide.

Sensor not reading? Download the SMG Flex Fuel Kit Troubleshooting Guide (PDF) for PCM pinning, connection checks, HP Tuners setup, diagnostic codes and warranty bench-testing/RMA instructions.

Why SMG?
We design our harnesses from hands-on experience building high-performance LS and LT combinations. Each harness is tested for proper fit, signal integrity, and durability — so you can focus on tuning and driving, not troubleshooting wiring.