Chart Type - Thermometer?

Does anyone out there know of a way to create a chart type that looks like a thermometer? I would like to have the "goal line" as 98.6 degrees and the 'fill' in the thermometer as the spreadsheet is updated. Possibly just one bar in a chart and take away the grid lines, chart border, etc. But I'm looking is some clever soul out there may have a better idea.

Thanks in advance.