DIY ENGINE WIRE HARNESS SHOP FOR CORE ECU BY HP TUNERS

CORE ECU by HP Tuners is among the most capable standalone engine management systems for GM Gen III and Gen IV LS-series engines. We want to help make your CORE ECU implementation a success by offering wiring and hardware solutions not available through HP Tuners.

Wire harness products are built in Erie, PA by EFI Connection, LLC!

LS engines often vary when it comes to sensors and fuel injectors. To make your engine's equipment plug and play, we offer an impressive selection of adapter and extension harnesses.

Browse our selection of Adapter Harnesses for  CORE ECU
Browse our selection of Extension Harnesses for CORE ECU 

We offer a complete selection of genuine OE connector kits for enthusiasts building their own engine wire harness. We also offer replacement terminals and cable seals!

Browse our selection of Connector Kits for CORE ECU 
Browse our selection of Replacement Terminals for  CORE ECU
Browse our selection of Replacement Cable Seals for  CORE ECU

Let us use our production tooling to create OE quality pigtail assemblies for your CORE ECU project. Simply choose your desired wire length and we'll do the rest! Wire sizes and colors even match production CORE ECU engine harness assemblies.

Browse our selection of Pigtail Assemblies for  CORE ECU

Our selection of OE quality automotive wire is unmatched. Choose from all wire sizes and color combinations found in production CORE engine harnesses—even fusible link wire.

Browse our selection of Automotive TXL Wire
Browse our selection of Automotive Fusible Link Wire

Genuine HP Tuners brand harnesses for CORE ECU cover a wide range of GM LS-Series engines. If your engine won't fully support a HP Tuners brand harness, see our Adapter Harnesses for plug and play compatibility.

When HP Tuners brand harnesses won't cover your engine and transmission configuration...
EFI Connection brand harnesses follow genuine CORE harness practices—using the same electrical center, twisted pair signal strategies, materials, and production crimp tooling. We are confident you'll find our build quality indistinguishable from genuine CORE harnesses.