Populate Taxonomy Value into New Form.aspx from DispForm.aspx

 var webTaggingCtl = $get(""+internalName+"_$container");

 var taxCtlObj = new Microsoft.SharePoint.Taxonomy.ControlObject(webTaggingCtl);                taxCtlObj.enableControl(true);                                                                                                        taxCtlObj.setRawText(listItem.get_item(internalName).get_label()+"||"+listItem.get_item(internalName).get_termGuid());

 taxCtlObj.retrieveTerms();

            

internalName=Taxonomy Column Name;

listItem.get_item(internalName).get_label()- To get Taxonomy Label name from list

listItem.get_item(internalName).get_termGuid() -To get guid from list