Koso GPS Speed Signal Converter For Koso Speedometers For applications where traditional wheel speed sensors aren't viable, the Koso GPS Speed Sensor offers a slick alternative. Harnessing the power of a 66 satellite antenna, this device calculates your speed and translates it into a pulse signal that can be read by any Koso speedometer. Features: Compatible with Koso Speedometer Compact size can be easily hidden Note: Not compatible with OEM speedometer.