Not sure if this has been requested before, but the Dial Gauge is pretty rigid in its configuration with regards to color and values.  

You can only have three color zones, and the color zones have to be, yellow, green, red in that order.   That assumes that something on the left/bottom is bad, something in the top/middle is good, and something far to the right is really bad.   This works fine for things like pressure, RPMs, etc but does not work very well for things like battery voltages where "8" could be just as bad as "15" for a 12V battery where both values need to be in the red.  A battery dial gauge really should be red, orange, green, orange, red.   (or possibly red, orange, green, red)

I think it would be much more useful to allow us to specify the number of color zones, and in which order.  This could be done with a table, kind of like how we can add multiple Dashboard Elements.  You click Add, specify the minimum and maximum values for the range you are creating, and then choose the color.   The item at the top would be the left/bottom color zone on the gauge.  The next item/range would be the next color zone on the gauge, etc  As a sanity check, you could require that the second color zone HAS to start from where the previous zone ends by pre-populating and graying out the field so it cant be changed.  This way, you couldn't overlap the end of color zone 1 with a value of like 11, and then start color zone 2 at 10.     I thought about having the ability to reorder these, but then I think you'd have to give up the sanity check...and that's probably not necessary anyhow since you can adjust the values and colors on each to match your needs.