SMG Universal GM Flex Fuel Sensor Wiring Harness
Harness only. Flex fuel sensor, fuel fittings, hose, and plumbing are not included.
The SMG Universal GM Flex Fuel Sensor Wiring Harness is designed as a direct replacement for an existing SMG Flex Fuel Kit or as a standalone wiring solution for DIY flex fuel installations, LS swaps, hot rods, race cars, and custom engine-management projects.
Built with OEM-style sealed connectors, automotive-grade wire, machine-crimped terminals, abrasion-resistant braided loom, and a dedicated white PCM signal lead, this harness provides a clean, professional alternative to cutting, splicing, or building a harness from scratch.
Compatibility
- Designed for GM applications using the newer LS3-style ignition-coil connector family
- Compatible with common LS3, L92, L99, LSA, LS7, and Gen V LT-style coil connectors
- Ideal for LS swaps, custom vehicles, race cars, hot rods, and replacement SMG harness installations
Not compatible with early LS1/LS6-style ignition-coil connectors.
Before ordering, compare your ignition-coil connector to the product photos. Connector styles can vary by engine, vehicle, and prior modifications. If you are unsure, send us a clear photo of your ignition-coil connector so fitment can be verified before purchase.
PCM Lead Length
- 12-inch PCM lead
- 24-inch PCM lead
- 36-inch PCM lead
When used outside a complete SMG Flex Fuel Kit, the installer must supply the compatible flex fuel sensor, fuel-line fittings, plumbing, calibration, and vehicle-specific PCM pin connection.
Made in the USA by SMG.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.