Oh, in that case, you just need to remove the old sensor, and put the new sensor in. There is a very tiny set screw under the sensor. 0.050" I think. Loosen it up, and the old sensor will slide out. Slide the new sensor in, and turn on the key. Slightly pull the brake lever and slide the sensor in until the brake lights turn on. Tighten the set screw and you are finished.