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    Sale!

    Holley Sniper EFI Input/Output Harness, Ground Trigger and Tach Output | 558-491

    Vendor: Holley Sniper EFI
    Part Number: 558-491
    Save $9.20
    $68.75 $77.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
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    Product DetailsFAQReviewsRelated Products

    This input/output harness gives access to two ground trigger inputs, three ground trigger outputs, points output, tachometer output, and digital gauge output wiring for Sniper EFI systems. Input grounds can be used for A/C kick or nitrous stage activation, while output grounds can drive electronic fan control or A/C shutdown at wide open throttle.

    Specifications:

    • Includes: (2) Ground Trigger Inputs, (3) Ground Trigger Outputs, Points Output, Tachometer Output, Digital Gauge Output (for Holley EFI Analog Gauges)
    • Wires: Individually Labeled for Easy Identification
    • Product Type: Input/Output Harness
    • Part Number: 558-491

    FAQ

    What can the 558-491 I/O harness be used for?

    Its input grounds can trigger A/C kick or nitrous stage activation, while its output grounds can drive electronic fan control or A/C shutdown at wide open throttle.

    Does it include a tachometer output?

    Yes, a labeled tachometer output wire is included.

    Is it compatible with Holley analog gauges?

    Yes, it includes a digital gauge output wire for use with Holley EFI analog gauges.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

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