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    Holley Sniper EFI I/O Harness, Ground Trigger I/O Wires & Tach Output | 558-491

    Vendor: Holley EFI
    Part Number: 558-491
    Save $6.57
    $59.12 $65.69

    Currently out of stock.

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    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
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    This Sniper EFI I/O harness adds ground trigger inputs and outputs plus tachometer, points, and digital gauge output wires to a Sniper EFI installation. The input grounds support functions like A/C kick or nitrous stage activation, while the output grounds can trigger electric fans or shut down the A/C compressor at wide-open throttle.

    Specifications:

    • 2 Ground Trigger Inputs
    • 3 Ground Trigger Outputs
    • 10-Pin Terminated Connector
    • Tachometer Output Wire
    • Points Output Wire
    • Digital Gauge Output Wire
    • Part Number: 558-491

    FAQ

    What does the Sniper EFI I/O harness add to a system?

    It adds 2 ground trigger inputs and 3 ground trigger outputs, plus tach, points, and digital gauge output wires.

    What can the input grounds be used for?

    The input grounds can be used for functions such as A/C kick or nitrous stage activation.

    What can the output grounds control?

    The output grounds can be used for electric fan control or A/C compressor shutdown at wide-open throttle.

    Does this harness include a terminated connector?

    Yes, it includes a 10-pin terminated end for easy connection.

    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.
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    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.

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