SPEEDBOX + Cable | GPS / VSS to Mechanical Drive Speed Converter

The SPEEDBOX converts GPS or VSS speed data into a mechanical drive output for cable-driven speedometers, making it a clean solution for classic vehicles, custom builds, and modern drivetrain swaps. It helps bridge modern speed signal inputs to older mechanical speedometer systems without giving up dependable speed operation. This version includes a mechanical drive cable for a more complete installation and easier integration into compatible applications.

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
• VSS Compatible — also supports Vehicle Speed Sensor input when preferred
• Cable Included — includes mechanical drive cable for installation
• Swap-Friendly Design — ideal for classic vehicles and modern drivetrain conversions
• Made in the USA — backed by a lifetime warranty