New Arrivals/Restock

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 truely 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.
Fuel Management Wiring Harness
Offers shortened main leads for better fitment in rear engine dragsters and boats that generally require shorter wires.
Wiring Harness
Wiring Harness, Fast Main Dragster/Boat
XFI Main Harness designed with short leads to ease XFI installation into rear engine dragsters and boats which require shorter wires. This in turn typically will save the installer time on having to cut, strip and re-crimp leads.
XFI Main Harness Dragster/Boat