I do have a solution to this problem. If you look at the connection to the power board where the other compass connects you will see the other side is not used. You can use the
P4P version one leg and connect the compass wire from that leg to the empty spot. It is hard to describe how to do this on here. As far as flying without this compass, You will get a compass error. If you want to contact me I can walk you through how to fix this. I have a bunch of used legs and would be glad to send you what you need.