Monthly Archives: July 2024


Holley EFI 558-501 GM 58X EFI Harness Kit

GM LS2/LS3/LS7, 58X Crank Sensor, USCAR/ EV6 Injector; An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important as the power side. Holley’s Holley EFI Harness Kit comes complete with the main harness, power harness and injector harness to support your primary system! Holley EFI 558-501

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