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SPEEDBOX | Without Cable | GPS / VSS to Mechanical Drive Speed Converter

SKU: A-299
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$473.28 USD
Converts GPS or VSS speed data into a mechanical drive output for cable-driven speedometers. Designed for applications that already have or require a separate mechanical cable. Built to simplify modern speed signal conversion in classic and custom applications.
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The SPEEDBOX converts GPS or VSS speed data into a mechanical drive output for cable-driven speedometers, making it a practical solution for classic vehicles, custom builds, and modern drivetrain swaps. It helps bridge modern speed signal inputs to older mechanical speedometer systems while keeping installation clean and functional. This version is supplied without a mechanical drive cable for applications that already have a compatible cable or require a separate cable choice.

Designed with a 7/8"-18 drive output thread and 0.112" square drive, the SPEEDBOX offers flexible compatibility for many mechanical speedometer setups. Its 170–1650 turns-per-mile calibration range supports a wide variety of speedometers, with a default calibration of 1000 turns per mile for most US speedometers. When used with the included GPS antenna, the SPEEDBOX can automatically calibrate from GPS speed data, while also supporting VSS input when preferred.

Key Features:

  • GPS / VSS Conversion — converts modern speed data into a mechanical drive output
  • Mechanical Speedometer Compatibility — designed for cable-driven speedometer setups
  • 7/8"-18 Drive Output Thread — built for compatible mechanical speedometer cable connections
  • 0.112" Square Drive — supports common mechanical speedometer drive requirements
  • Wide Calibration Range — adjustable from 170–1650 turns per mile for diverse speedometers
  • Default US Speedometer Calibration — preset to 1000 turns per mile
  • GPS Auto Calibration — automatically calibrates using the included GPS antenna
  • Dash-Mountable Design — compact box can be installed in the dashboard
  • No Cable Included — ideal for applications using a separate or existing cable
  • Swap-Friendly Design — ideal for classic vehicles and modern drivetrain conversions
  • Made in the USA — backed by a lifetime warranty

If you are running GPS only:

  •  Verify that the GPS antenna is mounted on the dash, or under fibreglass. It will not work if it is under metal, or inside a building.
  • The magnetic side of the antenna must be facing down.
  • Ensure the red light on the side of the Speedbox is solid. If it is blinking, the GPS signal is not acquired. It shouldn't take more than 5 minutes to acquire a signal if installed properly.
  • Press the button to enter Speedbox offset to see if the pointer moves, then turn it off without pressing button again. This verifies that the motor is working and has power.


If you are running VSS:

  • The Speedbox will default to GPS if connected, with VSS as a fallback.
  • The Speedbox must be driven over 25 MPH with GPS connected for a couple of miles to calibrate the VSS signal
  • If it is still reading off,  set the Speedbox offset. Press the button and the pointer will move up to around 60 mph / 96 kmh. Then press and hold the button to move the pointer to exactly 60 mph or 96 kmh. Releasing and holding the button again will change movement direction. Release the button for about 5 seconds to exit the offset setting and resume operation.
  • Verify that your Speed sensor is wired properly, and test it if possible. You will need an oscilloscope or another gauge to test the sensor. 


If it is still reading lower, disconnect the speed cable from the speedometer and try to spin the driver by hand to feel for binding. It should spin smoothly.

There are two styles of speed cable: Thread on and clip on.
You can inspect your current speed cable, if it has threads then you need a thread on. If there are no threads, you need a clip on.

We have some speed cables for select makes, if yours is not listed you may need to get a custom speed cable.  You can order a Speedbox with no cable. 

Deluxe Speedometer and Cable services in Colorado makes all our Speedbox cables, you just need to mention it's for a Speedhut speedbox.


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