the two wires going to the sensor in the pad. As soon as the link is opened, the message appears. Shorting the two wires going to the pad sensor will disable the system. If you still have a good sensor, just plug it in and attach it somewhere out of the way of the front wheel system. It will also short the two wires disabling the message, and will be a more clean solution.
If you have an already wore sensor, just bridge the two copper inserts in the sensor with some copper wire and soldering, or simply cut out the sensor and join the two wires. Then plug and attach it as described before.
Javier