Gentlemen,
Thank you for your input. I agree with many of the points raised here. This, however, keeps me coming back to my original question. Why have it? Particularly as "THE" main engine indication when N1 speed is provided anyway. In an age when aircraft design is directed towards reducing crew work load, aircraft weight and complexity, EPR seems unnecessary. It is a system that is prone to error (leaks, blockages, probe icing, xmitter faults...) and has been on more than one occasion a contributing accident factor. If Rolls or Pratt are listening in, why this extra instrument to deal with? (too much to hope for I suppose).