Hi @ineedqshelp ,
do you need help with the first steps?
In the visuals pane you can find the Highcharts icon (the last one):
Click on that icon.
Now you can add multiple dimensions (GROUP BY section) and measures (VALUE section) on the left side ot the picture).
Next step is to edit the code to create your specific visual. Therefore click on the “format visual” button, that is highlighted in the picture.
Now you can expand the Chart code section.
To get example code from your demo (e.g. Multiple KPI gauge Demo | Highcharts) you have to click on the 
“Code” button in the right upper corner.
If JSON is new to you, I would suggest to begin with small little changes in the example code from Quick Sight.
If this helped you, please mark my answer as solution. That helpes the community to find solutions faster.
Best regards,
Nico