Dial percent chart - Help to set dial alert value - Apex 4.2

Hi,I am using Oracle apex 4.2

I created a Dial percent chart (HTML 5) which displays the CPU utilization percent from the database (ajax).

Query:

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SELECT (100-idle) value, 

       100 max, 

       0 low, 

       80 high

FROM CPU_UTIL

There is no problem displaying the chart.

However I got an additional request to enhance the chart to visually alert if the value is above 80%.

A color coded response that could do the following (any one):

    1. Changes the dial color when the value > 80%

    2. Change the needle color

    3. Set a marker inside the dial that shows the 80% limit.

Bottomline the chart should give a visual clue/alert that CPU exceeded 80%.