Installation is VERY simple, first remove the lower half of your NTE5 socket :-

(If you do not have an NTE5 you can get one HERE
http://www.run-it-direct.co.uk/shop2.php?id=7This will reveal the engineer test socket that the new faceplate plugs into :-

If you have extension wiring note which colour wires are going to terminals 2, 3 & 5 :-

Now using an IDC tool reinstall the wires like for like into the ...