Overview Reviews Product Description 558-433 Holley EFI Digital Dash I/O Adapter w/Unterminated Vehicle Harness I/O Adapter w/Unterminated Vehicle Harness Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-433 Holley EFI Digital Dash I/O Adapter w/Unterminated Vehicle Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *