Speedo Healer Speedometer Correction for Tracks Polaris or larger tires
Speedometer Calibration Gear Box - Corrects your Speedometer! - IH Parts America
Installation of Yellow Box Speedometer Recalibrator The Yellow Box (YB) speedometer correction recalibrator corrects for built-in manufacturer speedometer error as well as the additional error caused by the installation of smaller or larger sprockets. Built-in ...
Electronic Speedometer Adjustment Module for Sportbike and Metric Crusiers.
Official home page of the Yellow Box Speedo Recalibrator
S13 and S14 Speedometer correction options *write up* - Nissan Forum | Nissan Forums