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The sensor that pics up the magnet as it turns on the wheel is run on 5V DC, there is no need to have a 12v + or _ve version as the 5V is entirely within the wiring for the speedo, its not earthed. The speedo has a 12V feed and then internal electronics to drop this to 5V and power the sensor, its this 12v feed that needs to match the bikes wiring.