The lines that you see on the DEMON display shown from left to right first show the prop shaft freq, then the count of how many props it has.
The TPK`s from the the classification manual help you demodulate the freq as the blades have already been counted, guess you can call it intel
So from the whole display the only thing that you can get from it is the targets speed, this is then handed to the TMA to give better your contact data, even though it displays to you how many screws the contact has the only purpouse is to realy gain speed knowledge, in real life workings this would be classified im sure
The old school way would have been the 3 minute rule using a maneuvering chart to plot a course and speed, so you can see TMA is a modern version of this too but minus the speed calculations hence DEMON
I hope this helps.