RS5000 trend expressions

Hello all, I am trending to signals in trendx for tuning a PID loop. My AI comes in at 0-4270 and my AO is 0-100%. When I select a pen it displays at the top tag/expression. I assumed this would work similar to Wonderware and be able to divide to scale my ai and ao to match up better on the trend and give me
a better view. I am unable to figure out how to write the expression though. Anyone know the trick? Thanks in advance!

Just scale it to a new tag and trend that. In X tab you can also select to trend scale to the preset of each tag. That way the setpoint and Pv are on the same scale.