I think if EPR gauge scales were shown as a percentage, instead of 1.387 or whatever, us pilots would find them much easier to use.
We want ballparks which we then fine tune. Setting 55% N1 is easy. Setting (and remembering) 1.432 or whatever is not.
Lose the decimal point and the digits after it. Have the scale read -10% to 110% say.
I believe that's what Airbus did with the "Thrust" indication.
I don't see the point of the EPR indication either.