Holley 558-420 Terminator EFI Input/Output KitThis kit contains 4 extra input wires and 1 extra output wire that the base Terminator EFI harness does not contain. Part Number: 558 420 PN 558 420 contains 5 extra input output wires that the base Terminator EFI harness does not contain. It contains Input wires for Inputs 1 4. It contains one wire for Output 2. These inputs and outputs can perform features and functions that must be programmed via Holley EFI laptop software. The software also
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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.
Part Number: 558-420
PN 558-420 contains 5 extra input/output wires that the base Terminator EFI harness does not contain. It contains Input wires for Inputs 1-4. It contains one wire for Output 2. These inputs and outputs can perform features and functions that must be programmed via Holley EFI laptop software. The software also contains instructions on how to program these.