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When you set up a Google Analytics Classic tool, you can choose between using GA Default Name, DTM Generated Name, or Specific Name.
When using the GA default name, then you can use Google Analytics as follows in script.
Without trackerName as variable
_gaq._getAsyncTracker()._trackPageview();
tracker = _gaq._getAsyncTracker(); tracker._trackPageview()
When using the GA DTM generated name, you can use Google analytics as follows in script.
Get the tracker name in DTM Google analytics classic interface:

_gaq._getAsyncTracker("ddf16922edc9c2318ea19ad8369fcc92")._trackPageview();
tracker = _gaq._getAsyncTracker("ddf16922edc9c2318ea19ad8369fcc92"); tracker._trackPageview()

_gaq._getAsyncTracker("alexisclassic")._trackPageview();
tracker = _gaq._getAsyncTracker("alexisclassic"); tracker._trackPageview()
When you create a Google Analytics Universal tool, you can choose between using GA Default Name, DTM Generated Name, or Specific Name.
ga('send', 'pageview');
When using the GA DTM generated name, you can use Google Analytics Universal as follows in script.
In this example, the tracker name is pulled from the DTM Google Analytics Universal interface:

ga('38f91ccf1ca252deaaba3c2fc421f0f3.send', 'pageview');

ga('alexisuniversal.send', 'pageview');