Holley- LS Coli Harness

Need to adapter your holley EFI system to a TFI Ignition? This is the harness you need! Works great with 1987-1995 Mustangs!

Main harness for Holley EFI  standalone.   Setup to use sensors on a modular engine.   Works with both Holley HP and Dominator.

Looking for a plug and play alternative for your stock or built late model factory EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness...

For Holley Dominator EFI Auxillary Output Harness   Dominator EFI Connector J2B Auxiliary Harness

For Dominator EFI System Dominator EFI Connector J2A Auxiliary Harness