This harness gives you the access to 2 Ground Trigger Inputs, 2 Ground Trigger Outputs, also the Points Output, Tachometer output, and Digital Gauge Output Wires. The Input Grounds can be used for things such as AC Kick, and nitrous stage activation! The Output Grounds can be used for Electronic Fan Control, or A/C Shutdown at WOT. This harness includes an additional 0-5v TPS output commonly used for Transmission Control units, and a Tach output wire to drive most common aftermarket tachometers.


  • Wires come individually labeled for easy identification
  • 4x 5’ Long Output Wires
  • 2x 5' Long Input Wires


        Brand Holley Sniper EFI
        Emission Code 3
        Product Type Input/Output Harness
        Part Number 558-497

        Fast Efficient Shipping

        Through our distribution network Deliveries can be as fast as Next Day Delivery.
        Delivery times vary by destination, tracking information is provided with every purchase.

        Get it Installed

        JB's Power Centre offers on-site professional installation services in Calgary and Edmonton, AB.
        We have on staff licensed Mechanical Technicians as well as MECP Certified 12-Volt Technicians.

        * Extend your products Manufacturer Warranty

        All products include a manufacturer warranty, but you can extend this warranty with
        JB's Purchase Protection Plan
        *Available on select products.