IAE engines have another problem. The ball park figures are always in N1 while the doughnuts are on the EPR guage. So you need to know appx. EPR value. Then you can just set the doughnuts to that value and get back to PFD to manage the trend. 1.05 is a good figure. Progressively increases to 1.18 to 1.2 with gear down and full flaps. Then again around 1.05 on the glide. Fine tune with trend arrow.