show changing temp in gauge chart

[jetpack]

I have a series of simple 180 degree gauge charts that represents a constantly changing temp. It has 4 ranges shown as areas in the gauge "cold", "cool", "warm", "hot".

The problem is: How to calculate the temp range as a % of the 180 degrees of chart represented on the gauge?

If the range is from "warm" to "hot", how can that constantly changing values be dynamically represented on the chart by the needle? The % areas represented by the colors on the gauge will varies from chart to chart, but the gauge always visually represent 180 degrees.

"value" cell for the gauge will be the number represented on the gauge.

Is there a formula to accomplish this task?

Any help greatly appreciated.

 

[Worf]

Do you still need help with this one?

 

[jetpack]

hiya mate.

i cobbled something together but it's sometimes crook. if ya got any pointers, I appreciate it.

 

[Worf]

This page has a nice, downloadable speedometer chart.

https://www.excel-easy.com/examples/gauge-chart.html