How do I get the workingSet of a process directly from OS and compare its value against processes plugin.

We are using Active Console here as the application process that we want to monitor its working set. Here are the steps:

From run, type perfmon.exe
Select "Performance Monitoring"
On the right pane toolbar, select "+" (see the screenshot)
A pop-up window will show, select 'Process" and then "WorkingSet" from the list.
in "Instances of selected object", select "ActiveConsole", "Add", then "OK". (see the screenshot)
From the right pane, third icon "Change Graph Type", choose "Report".
You should get this as final view where you can use it to compare the value against processes plugin, working set column.