Speedhut Speedbox w/ GM/Ford/Chrysler Thread-on Cable 5/8-18 (A-368)

Description

The Speedhut Speedbox w/ GM/Ford/Chrysler Thread-on Cable 5/8-18 (A-368) offers a seamless solution for integrating your existing mechanical speedometer with modern vehicle systems. This innovative device expertly converts either a precise GPS signal or a Vehicle Speed Sensor (VSS) input into a mechanical rotation, directly driving your original, cable-driven speedometer. This eliminates the need to replace your classic gauge when upgrading to a transmission without a mechanical output or when seeking enhanced accuracy through GPS-based speed measurement. The included 3-foot long speedometer cable features a 5/8-18 thread, specifically designed for direct compatibility with many General Motors, Ford, and Chrysler speedometers.

KEY FEATURES AND BENEFITS:

• Dual Signal Input: Accepts both GPS signals (via the included antenna) and VSS signals from contemporary electronic transmissions, providing flexibility in various installation scenarios.
• Mechanical Drive Output: Features a 7/8″-18 drive output thread and a standard 0.112″ square drive, ensuring compatibility with a wide range of mechanical speedometer cables.
• Direct Cable Connection: This specific A-368 model includes a 3-foot long speedometer cable with a 5/8-18 thread, offering a direct connection to many GM, Ford, and Chrysler speedometers.
• Precise Calibration: Capable of calibration across a broad range of 170 to 1650 turns per mile (TPM), allowing for accurate speedometer readings with various gauge specifications. It also comes pre-calibrated for US standard 1000 TPM speedometers.
• Simplified Installation: Designed for easy setup, requiring only basic 12-volt power and ground connections. GPS functionality operates without any subscription fees.
• Compact and Integrated: The unit boasts a compact form factor, facilitating discreet mounting within the dashboard or engine bay.

SPECIFICATIONS:

• Input Signal: GPS or Vehicle Speed Sensor (VSS)
• Output Type: Mechanical Rotation
• Output Drive Thread: 7/8″-18
• Output Drive: 0.112″ Square
• Cable Compatibility: GM, Ford, Chrysler Thread-on
• Cable Thread: 5/8-18
• Cable Length: 3 Feet
• Calibration Range: 170 – 1650 Turns Per Mile (TPM)
• Pre-calibration: 1000 TPM (for US Speedometers)
• Power Requirement: 12 Volts
• Dimensions (Approximate): 5.13″ (Length) x 3.72″ (Width) x 1.93″ (Height)
• Weight (Approximate): 1.5 lbs
• Included in Purchase: SPEEDBOX converter unit, 3ft speedometer cable (5/8-18 thread), GPS antenna, Power harness.

HOW TO USE:

• Mount the Speedbox: Choose a suitable location within the vehicle, ensuring it is protected from extreme temperatures and moisture. Secure the unit using appropriate fasteners.
• Connect Power and Ground: Connect the provided power harness to a reliable 12-volt power source and a suitable ground point in your vehicle’s electrical system.
• Install the GPS Antenna (Optional): If you intend to use GPS as your speed source, mount the GPS antenna in a location with a clear view of the sky, typically on the dashboard or roof. Connect the antenna cable to the Speedbox.
• Connect the Speedometer Cable: Thread the 5/8-18 end of the included 3-foot speedometer cable to the back of your GM, Ford, or Chrysler mechanical speedometer. Connect the other end of the cable (with the 7/8″-18 thread) to the output drive of the Speedbox unit. Ensure a secure connection at both ends.
• Connect VSS Signal (Optional): If you prefer to use a VSS signal, locate the speed sensor output wire from your transmission control unit (TCU) or engine control unit (ECU) and connect it to the designated VSS input wire on the Speedbox wiring harness. Consult your vehicle’s wiring diagram for the correct wire.
• Calibration (If using VSS): If using a VSS signal, you will need to calibrate the Speedbox to match your speedometer’s turns per mile (TPM) rating. Follow the specific calibration instructions provided in the Speedhut product manual. GPS input typically requires no manual calibration.

BENEFITS OF USING THE SPEEDHUT SPEEDBOX W/ GM/FORD/CHRYSLER THREAD-ON CABLE 5/8-18 (A-368):

• Preserves Original Aesthetics: Allows you to maintain the classic look and feel of your vehicle’s interior by retaining the original mechanical speedometer.
• Ensures Accurate Speed Readings: Provides precise speed information derived from either reliable GPS data or a calibrated VSS signal.
• Simplifies Modern Drivetrain Swaps: Facilitates the use of your existing speedometer even after upgrading to a modern transmission that lacks a mechanical output.
• Offers Flexible Speed Source Options: Gives you the choice between GPS-based speed measurement, which is inherently accurate and doesn’t require calibration, or utilizing the vehicle’s existing speed sensor.
• Provides a Direct Connection for Common Speedometers: The included cable with a 5/8-18 thread ensures straightforward compatibility with many GM, Ford, and Chrysler speedometer units.

FEATURES:

• Accepts Input from Global Positioning System: Utilizes satellite signals for precise speed determination.
• Compatible with Vehicle Speed Sensor Output: Can interface with electronic speed signals from the vehicle’s computer.
• Generates Mechanical Rotation Output: Creates the physical movement needed to drive traditional speedometer cables.
• Includes a Pre-Attached 3-Foot Cable: Offers a ready-to-install connection to compatible speedometers.
• Wide Calibration Adjustment: Accommodates a broad spectrum of speedometer sensitivities.
• No Subscription Required for GPS Functionality: Operates without ongoing service fees.
• Easy Electrical Connections: Requires only basic power and ground wiring.
• Designed for Discreet Mounting: Its compact size allows for concealed installation.