If someone can design the source Flash and post it I'll fix it and create a public function to manipulate the dials in the guage.
To see the Gauge, press the Initialize button, then you can update the value of the speedometer by changing the value textfield on the right hand side, and hitting the 'update value' button.
You can change the parameters to create the gauge, however, I suggest that you click refresh before you change the parameters to it loads the flash file again. I currently do not have it reset the gauge when you press 'Initialize'.
All feedback is welcome, and Frodo, let me know if this is the sort of thing you were looking for.