Description

The Speedhut Speedbox w/ GM Clip-on Cable (A-369) offers a seamless solution for connecting your classic General Motors mechanical speedometer to contemporary speed signal sources. This innovative device bridges the gap between vintage aesthetics and modern technology, allowing you to retain the look and feel of your original gauge while benefiting from the accuracy of GPS or Vehicle Speed Sensor (VSS) inputs. Designed for straightforward installation and reliable performance, the Speedbox A-369 is ideal for vehicle upgrades where the original mechanical drive is no longer available or desired.

KEY FEATURES AND BENEFITS:

• GPS and VSS Compatibility: Accepts signals from the included GPS antenna or a Vehicle Speed Sensor, providing flexibility in speed source selection. It can even prioritize GPS data when available for optimal accuracy.
• Mechanical Speedometer Output: Features a standard 7/8"-18 drive output thread and a 0.112" square drive, ensuring compatibility with most mechanical speedometers.
• Direct GM Connection: Comes equipped with a 3-foot long GM clip-on style mechanical speedometer cable, specifically designed for direct connection to compatible GM speedometers, simplifying the installation process.
• Simple Power Connection: Requires only a basic 12-volt power and ground connection, making wiring quick and easy.
• Wide Calibration Range: Offers an extensive calibration range from 170 to 1,650 turns per mile, accommodating various speedometer sensitivities. The default setting of 1,000 turns per mile is suitable for most US-market speedometers.
• Automatic and Manual Calibration: Supports automatic calibration using the GPS signal for hassle-free setup. Manual calibration is also available for VSS inputs, typically involving driving a measured distance.
• Compact and Installable Design: The unit’s compact form factor allows for discreet mounting within the dashboard or engine bay.
• No Subscription Fees: The integrated GPS functionality operates without any ongoing subscription costs.

SPECIFICATIONS:

• Speedometer Cable Attachment: Male threads/Clip-on
• Speedometer Cable Thread Size: 7/8-18, Clip-on
• Drive Output Thread: 7/8 in.-18
• Drive Output Square: 0.112 in.
• Calibration Range: 170-1,650 turns per mile
• Default Calibration: 1,000 turns per mile (for US speedometers)
• Power Requirement: 12-volts and ground
• Items Included: Speedbox unit, GPS antenna, power harness, 3 ft GM clip-on speedometer cable.

HOW TO USE:

• Mount the Speedbox: Choose a suitable location within the vehicle (e.g., behind the dashboard or in the engine bay) and securely mount the Speedbox unit.
• Connect Power and Ground: Connect the provided power harness to a 12-volt power source and a reliable ground.
• Connect the Speedometer Cable: Attach the included 3-foot GM clip-on speedometer cable to the output of the Speedbox and then connect the clip-on end to the back of your GM mechanical speedometer.
• Install the GPS Antenna (Optional): Mount the GPS antenna in a location with a clear view of the sky and connect it to the Speedbox unit.
• Calibration (GPS): If using GPS, the Speedbox can automatically calibrate. Follow the manufacturer’s instructions for initial setup, which often involves driving the vehicle for a short distance to allow the GPS to establish a signal and calibrate.
• Calibration (VSS): If using a Vehicle Speed Sensor, manual calibration will be required. This typically involves driving a precisely measured mile and following the Speedbox’s calibration procedure (refer to the product manual for specific steps).
• Secure Wiring: Ensure all wiring connections are secure and properly routed to prevent any interference or damage.

BENEFITS OF USING THE SPEEDHUT SPEEDBOX W/ GM CLIP-ON CABLE (A-369):

• Maintain Original Aesthetics: Keep the classic look of your GM dashboard by retaining your original mechanical speedometer.
• Achieve Modern Accuracy: Benefit from the precise speed readings provided by GPS or a modern VSS.
• Simplified Upgrades: Makes it easier to install modern transmissions or engine swaps that lack a mechanical speedometer output.
• Easy Installation: The straightforward wiring and included GM-specific cable simplify the setup process.
• Versatile Compatibility: The wide calibration range ensures compatibility with a broad range of mechanical speedometers.
• Cost-Effective Solution: Offers a reliable way to integrate modern technology without the expense of replacing the entire gauge cluster.

FEATURES:

• Dual Input Capability: Seamlessly switches between GPS and VSS signals for optimal speed source.
• Pre-Configured Cable: Includes a ready-to-use 3-foot GM clip-on mechanical speedometer cable.
• Automatic GPS Calibration: Simplifies setup and ensures accuracy without manual calculations.
• Broad Output Compatibility: Designed to work with most standard mechanical speedometer inputs.
• Durable Construction: Built to withstand typical automotive environments.
• Plug-and-Play Wiring: Requires only basic power and ground connections.
• Compact Footprint: Allows for flexible mounting options within the vehicle.