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Holley 558-127 EFI Benchtop Harness

Name: Holley 558-127 EFI Benchtop Harness
Brand: Holley
Price: 342.99 CAD
Availability: InStock

by Holley

• SKU: ds_BBVL_558-127

• Product Type: Computer Chip Programmer Input Cable

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$342.99

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Holley 558-127 EFI Benchtop Harness

Rock Solid Hitch

Solid hitch with serious strength and clean powder coat, heavy to lift, but installs easy and tows perfectly!!

Great Shipping

Shipping was quick and on time - exactly what I needed for my small-block build - would buy again for sure

Perfect Fit Mats

Weatherbeater mats fit my work truck perfectly. Dropped them in and nothing moves. Truly a great upgrade

Sleek Visors

Window visors look incredible and feel durable, install was simple. Zero wind noise on the highway!

Leveling Success

Leveling kit components were well packed. Instructions lacking, but online videos helped. Rides level now and feels planted.

Found Single Lifters

Found single lifter pairs in stock here when others required full sets, fast shipping got me racing again, hell yeah!!

Desert Series Bumper

Rear bumper upgrade looks better than factory plastic. Install was easy, and functionality is miles ahead. Highly recommended.

Lomax Fitment

Tonneau cover fit is excellent. Clear instructions and a smooth install. Delivery to my door was super convenient

Next Day Turbo

Turbo arrived next morning and matched description. Bolted up cleanly and truck is back to full power.

Legend Grille Guard

Husband’s birthday grille guard is rock solid, looks sharp he loves it so much!!! Thanks again

Shipping Protection Helped

Customer service handled a damaged shipment immediately. Refund was painless. I’ll shop here again.

Easy Exhaust Install

Exhaust system installed in two hours on my first try. Perfect fit and the sound is pure joy.

Do you offer wholesale or jobber pricing?

Yes. Wholesale pricing is available for legitimate businesses that provide a valid business number or equivalent proof. Ongoing purchase volume is required to maintain discount eligibility. One-time personal buyers aren’t eligible.

Will this part fit my vehicle?

If a product page clearly lists fitment for your vehicle and the description leaves no reasonable doubt, we’ll cover the cost of return if it doesn’t fit. Exclusions apply if prior modifications cause the issue. When browsing self-serve, you’re responsible for confirming compatibility by checking manufacturer fitment data and notes. If unsure, contact us before ordering and we’ll verify it for you.

Do you offer technical support or installation advice?

We help where possible on a case-by-case basis. Most manufacturers include detailed instructions and tech support contacts. Because our catalog spans hundreds of brands, we can’t provide every torque spec or procedure, but we’ll connect you with the manufacturer if needed.

Do you offer price matching?

We don’t guarantee price matching, but we’re happy to review a legitimate in-stock offer from another Canadian retailer. The comparison must include all costs such as product price, shipping, taxes, and fees, and the item must be identical and available for immediate purchase. We won’t lose money to match unsustainable or out-of-stock pricing.

Can I exchange an item?

Yes. In-store exchanges happen on the spot when stock is available. For shipped orders, the original item must be returned first. Once received and inspected, we can issue a store credit toward the correct part or replacement. We can’t send a second item while the first is still in your possession without payment for both.

Are prices shown before or after tax?

All prices on the site are before tax. GST, HST, or PST is calculated at checkout based on your shipping address..

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Description_DEF	Computer Chip Programmer Input Cable
Description_DES	Holley EFI Benchtop Harness
Description_INV	BENCHTOP EFI HARNESS
Description_EXT	Benchtop Wiring Harness; Incl. CAN/Crank/Cam/TPS/Input 1/P1A/Main Power/Sniper EFI Connectors;
Description_FAB	Terminated connectors for several EFI inputs
Description_FAB	Included power switch allows for a quick ΓÇ£install" on your test bench
Description_FAB	Great for ECU diagnostics that do not require a running engine, firmware updates, or 7" dash calibrations
Description_KEY	bench harness; bench top harness; dominator test harness; ecu test harness; hp test harnes; terminator x test harness; efi test harness; bench; ecu bench harness; dominator bench harness; hp bench harness; terminator x bench harness; ecu bench harness;
Description_SHO	CpCnctCbl
Description_MKT	Designed for benchtop testing and setup of HP, Dominator, Terminator X, Terminator X Max, and Sniper ECUs, as well as 7 in. dashes. Great for ECU diagnostics, firmware updating, or pre-configuring dash layouts without being in the vehicle. Harness has pre-terminated connectors for the following sensor inputs: CAN, Crank, Cam, TPS, Input #1, P1A, Main Power, and Sniper EFI connectors for a Sniper main harness. Also includes a power switch for quick setup in your workspace. Power and Ground flying leads need to be connected to your battery or power supply. (Not included)
Product Type	Harness
WARNING CA Proposition 65	Yes
WARNING CA Proposition 65 Message	WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Warning	California Proposition 65
Brand	Holley EFI
Emission Code	6
Length	2.3500
Width	10.5000
Height	10.8000
Weight	0.9200