SPEEDBOX 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. 

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.

May be purchased either with a mechanical drive cable for a more complete installation and easier integration into compatible applications, or without for applications that already have a compatible cable or require a separate cable choice.

Key Features:

• GPS / VSS Conversion — converts modern speed data into a mechanical drive output
• Mechanical Speedometer Compatibility — designed for cable-driven speedometer setups
• Cable Included — includes mechanical drive cable for installation
• Swap-Friendly Design — ideal for classic vehicles and modern drivetrain conversions
• Clean Installation — helps simplify speedometer integration in custom applications
• Made in the USA — backed by a lifetime warranty

Speedbox Mounting Template 

Speedbox Instructions