Skip to Product Info
    • 558-329_01.jpg
    • 558-329_02.jpg
    • 558-329_03.jpg
    • 558-329-adaptor.png
    Sale!

    Holley Sniper 2 Tach Input Ignition Adapter, CD Box One-Wire | 558-329

    Vendor: Holley EFI
    Part Number: 558-329
    Save $3.73
    Sale Price $29.86 Regular Price $33.59

    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.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
    Payment & Security

    Secure, encrypted checkout. Card details go straight to the payment processor and are never stored by us.

    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa
    Share to:

    This single-wire adapter provides an RPM signal to a Sniper 2 ECU from a CD ignition box when timing control isn't being used, making for a quick, straightforward install.

    Specifications:

    • Harness Type: Ignition Adapter, Tach Input Only
    • Ignition Type: CD Ignition (No Timing Control)
    • Connector: Black connector with purple wire
    • Installation: One-wire
    • Sub Category: Universal
    • Warning: California Proposition 65
    • Part Number: 558-329

    Plugs into the connector labeled "IGNITION" on the main harness. The yellow/black lead connects to the ignition box's "Tach Out" terminal — do not connect directly to the ignition coil. Refer to the installation instructions for full details.

    FAQ

    What does this adapter do?

    It supplies an RPM signal to the ECU from a CD ignition box for a Sniper 2 system that isn't using timing control.

    How many wires does installation require?

    Just one — the yellow/black lead connects to the ignition box's "Tach Out" terminal.

    Can I connect this directly to the ignition coil?

    No, it must connect to the ignition box's "Tach Out" terminal, not directly to the coil.

    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.

    For any questions or concerns, please contact us — we’re always happy to help.

    Recently Viewed