Just got the new cell and sensor. Basicly understand how to switch unit out. However, new sensor has a small pc board attached and also has a black jumper in a plastic bag, not sure if I am to use this jumper or not and for that matter whether or not to use small pc board. A pool person told me not to use the little pc board, little confused about that. Also have an extension cable that connects to the small pc board, would think that is to make an easier installation. So a little help to understand what to do. thanks