Since the Gauge chart has an Actions tab you could maybe treat it like a button and add a variable flag that's set on/off by selecting the gauge.
The background colour, on the Colour Tab, could then be calculated using that flag..like the attached.
Is that the effect you're after ?,
Gauge.qvw 138.5 K
This is possible. I am attaching the example for your reference.
hdonald is right, we need to use Variable and Trigger. I have changed the trigger events and used the same variables. Here are the steps on how to get this effect.
1. Press Alt + Ctrl + S (Sheet Properties) then Select the Triggers and Select the ObjectID (CH03) in our example
2. Use the OnActivate event and use the Set Variable action. We use have vG1 and Value as =if(vG1=1, 0, 1)
3. Now we will use OnDeActtivate event and use the Set Variable action. We use the same variable with different Expression Value as =if(vG1=0, 1, 0)
I hope this helps!
Cheers - DV