Home - Return to Previous Page
Additional Images

F.A.S.T. Main Harness - Universal

EFI Wiring Harness, Main Harness, Flying Leads, Weatherpack Connectors, Unassembled, FAST XFi / XFI 2.0, Universal, Kit
Availability: Same Day Shipping!


XFI Main harness designed for a custom car builder, resto-modder or for any enthusiast who wants to take all the slack out of the harness and install an XFI fuel injection system in the cleanest way possible.

FAST offers several main harness options to accommodate most customers' needs. The XFI Main Harness is responsible for connecting your XFI ECU to sensors as well as digital dashes, EGT modules, and various optional accessories. The Main Harness also handles communication between the ECU and ignition devices. Main harnesses are available in TPI, LT-1, LS-1 through 9 (including truck/SUV designs), Modern HEMI, Carburetor Conversions and even Rear-Engine Dragsters and Boats. FAST also offers Main Harnesses that come terminated on the sensor side but non-terminated on the ECU side to allow for a truly custom fit. All terminals, seals and connectors are available individually, so don't hesitate to try your hand at crafting your own custom harness from start to finish.


These products may contain a chemical known to the state of California to cause cancer and birth defects or other reproductive harm

Shipping Information

  • Item Requires Shipping
  • 7.0 lbs.
  • W14.6000” x H4.3000” x L14.9000”
  • Standard Ground Shipping