The Yellow Box is a speedometer recalibrator for motorcycles, cars and trucks.
It corrects for the usual stock speedo errors and gearing change speedo errors etc.
The Yellow Box is easy to use and remains on the bike correcting the speedo
in real time. Installation is a simple 4 wire splice connection or quick plug-n-play.
The speed correction can be easily changed at any time to compensate for tyre wear,
MPH-KPH or KPH-MPH conversions needed on the road while travelling.
Features of the Yellow Box v4 -- Model No. YB4
Corrects both the speedo and odometer by the same percentage/correction ratio
Speedometer correction range; -50% to +100% (1:2 to 2:1 ratio range)
Fine correction adjustment; 0.5% steps
KPH-MPH and MPH-KPH speedo conversion
Bright LED displays switch settings and test modes
System testing on power-up, inbuilt input and output tests
High-speed microprocessor accuracy, instant response, no speedo lag
Fully digital, exact, instant adjustment
Conveniently powered from speed sensor power
Power supply voltage; 5 to 16 volt
Very low power consumption (20mA)
Tiny size; 37 x 62 x 14mm, weighs only 32 grams
Rugged water and vibration proof encapsulation
Strong mounting hole and connector strength
Compatible with most modern motorcycles, cars and trucks
Legendary reliability and 10 year replacement warranty!
How it works
To learn more about speed sensors see
The Yellow Box receives electrical pulses from the vehicle speed sensor.
The high-speed microprocessor (tiny computer) inside the Yellow Box uses
our proprietary digital software to precisely correct the signal pulses.