Granted, this could probably be made more configurable, but this is just the first crack at it. So, right now, you can set the label, target, actual value and give the ranges that would indicate "bad", "satisfactory" or "good". You can also specify how many tick marks should be shown on the quantitative scale.Feel free to check it out here (view source is enabled) or download the zip here.
I highly recommend Stephen's book for anyone who is creating any application that needs to display complex data. You don't have to be building a traditional "Dashboard" put his suggestions to good use.