This Kit is designed to Indicate the state of a set of Points. The position of the Sensor and the magnet is shown in the drawing. Set it up with the points set at straight through and the sensor about 10 to 15mm from the lever. Glue the magnet to the moving lever of the points. When the points are changed the magnet should move to within 10 to 5mm of the Reed, this will then change the state of the switch.