Overview Reviews Product Description 558-307 Holley EFI Universal Coil On/Near Plug Harness Universal Coil On/Near Plug Harness – Use to connect Holley PN 558-312 or factory GM LSx coil harnesses to Holley HP or Dominator ECU's Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-307 Holley EFI Universal Coil On/Near Plug Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *