Holley EFI Pro Dash Service Harness

Part # 558-446 Be the first to write a review

Replacement Harness

Estimated Ship Date: 06/19/2026

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Emissions

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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Replacement Harness for Holley EFI Pro Dashes.

Features:

Replacement/Service
For Pro Dash product line
TE Superseal 34 pin connector
Refer to Owners Manual for correct inputs and outputs

About Holley EFI

Find standalone EFI for LS, Coyote, Hemi and more at Holley.com. From engine swapping to managing up to 4000 horsepower, we have a solution for every project!

Brand	Holley EFI
Category	Vehicles, Equipment, Tools, and Supplies
Color	Black
Emission Code	5
Grade Type	Performance
Part Type	Computer Chip Programmer Input Cable
Product Type	Digital Dash Harness / Adapter / Module
Sub Category	Engine Service
Universal Or Specific Fit	Specific
UPC	090127060186
Part Number	558-446

Instructions - 199r12075.pdf

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*Free Shipping and Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.

Holley EFI Pro Dash Service Harness

Holley EFI Pro Dash Service Harness

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