About Us

We supply high quality products for motorcycle and automotive use.
Our product reliability and product support receive the highest respect
throughout the racing industry and from automotive dealerships worldwide.

We stand by our 10 year guarantee!

Yellow Box Speedometer Recalibration
The Yellow Box corrects the speedometer and odometer of all vehicles
that use a hall-effect speed sensor to generate the speedometer signal.

Motorcycles; sportsbikes, Harley Davidson, cruisers, road, trail, trikes,
custom bikes, racing, snowmobiles. Cars and trucks; sportscars, 2WDs,
4WDs, pickup trucks, utes, off-road vehicles, kit cars and custom cars.

There are many causes of speedometer error;