3 color Gauge

Hello all -



I am fairly new to Sencha's products and am currently working on a Gauge. So far I have everything working correctly. But I would like to add a greater visual experience for my users and I can't figure out how to do it or if it can be done.



This is what I want:



if (value < 1.5) - set colorSet to red

if (value > 1.5 && value < 3.5) - set colorSet to yellow

if (value > 3.5 - set colorSet to green



It's so simple yet I cannot get it to work!



PLEASE HELP!