
Holley Engine Control Module (ECM) Wiring Harness for Wire Harness Kit - EFI Terminator I/O - Part #558-420
EFI Wiring Harness - Input / Output - Holley Terminator EFI - Each
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This kit contains 4 extra input wires and 1 extra output wire that the base Terminator EFI harness does not contain.
Overview
EFI Wiring Harness
- Input / Output
- Holley Terminator EFI
- Each






