1 Reply
Cary Glenn

You could change the end value of the dial properties to larger number, like 360, and then have the layer trigger be "Show layer X when dial turns If Dial is between 1 and 40. It might take a while to create the interaction. 

I would suggest instead of a dial use either "Show layer when shape (a section of the pie chart) is clicked" or "Show layer when shape (a section of the pie chart) is hovered over.