Classic Instruments® - All-in-One Wire Harness

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Product Details

Universal All-in-One Wire Harness (SNT56-GBW) by Classic Instruments®. Tremec T-56 Magnum transmission is equipped with 3 electronic connections that control the vehicle speedometer output, reverse lockout, and reverse lights. Hot rod and aftermarket applications of this transmission do not offer a convenient process for connecting the reverse lockout feature. Many have turned to workarounds such as connecting the reverse lockout to the brake light switch. While this method works, it can lead to premature wear on the reverse lock-out solenoid and often requires several additional wiring harnesses which adds time and potential complication to the process. Bowler’s easy-to-install harness provides proper OE functionality for the reverse lockout feature, plus reverse light connection and VSS signal, all with one setup. The harness is also equipped with 2 independent speed sensor outputs, one for the speedometer and one for the ECU if needed. This harness prevents the need for extra parts, time, and complication.


  • Designed to enhance your vehicle's style and functionality
  • Unique design to help you show off your personal style
  • Perfect blend of style, quality, and dependability

Each, and every one of gauges and sending units by Classic Instruments is designed, assembled and calibrated with pride and quality in Boyne City, Michigan. Brand’s proudly "Made in the USA" products are designed and built for street rods by street rodders! Each part is designed and assembled to exacting top of the line specifications and tolerances. Component testing at each stage of the assembly process assures the accuracy and reliability products by Classic Instruments are famous for.

Classic Instruments® is the first and only manufacturer to combine all-electrical instrumentation and micro-chip technology with the finest quality, accuracy, and vintage styling available at any price. Unique concepts and trend-setting designs by Classic Instruments have kept the brand ahead of the industry for over 37 years.

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Vehicle Fitment

This part is universal
  • Fits Following Transmissions: Tremec T56
  • Specifically for Borg Warner GM T-56 Transmissions.


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Classic Instruments® - All-in-One Wire Harness

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