Fixing the Endpoints of a Horizontal Bar Speedometer

Hello,

I am using a horizontal bar speedometer in my MashApp to illustrate the progression of my process maps from 0% to 100% complete. As such I would like to fix the endpoints of my bar speedometer at 0 and 100. However, as it stands right now when I enter 15% into the bar speedometer MashZone makes the endpoints 14 and 17 respectively. Can someone please tell me how I can fix the endpoints of my bar speedometer at 0 and 100?

Thanks,

Thomas