This replacement harness is included with standalone Holley digital dashes and is available separately as a direct-fit service part, with new connectors and unterminated sensor leads for a clean install.
Specifications:
- Application: Standalone Pro Dash
- Connector Color: Black
- Contents: New connectors, unterminated sensor leads
- Fit: Direct replacement, plug-and-play
- Universal Or Specific Fit: Universal
- Warning: California Proposition 65
- Part Number: 558-457
FAQ
What is the 558-457 harness used for?
It's the service replacement harness included with standalone Holley Pro Dash displays.
Are the sensor leads pre-terminated?
No, the sensor leads are unterminated so they can be wired to match your specific sensors.
Is this a direct replacement?
Yes, it's a plug-and-play direct replacement with new connectors.

