Well this is what I was shown, might be wrong, but works for me on the NG and also used on the 300.
Power settings approach two engines, aircraft weight, just set the same power as weight and it works, ie: 57.5 weight,+ 57.5 N1.
Single engine approach, as above just add 15
Bear in mind you might need a bit more or a bit less, this is just a reference point.
Good luck