how to add network service to local event log readers group via GPO

i will use group policy preference to add them into Event log readers


http://www.grouppolicy.biz/2010/01/how-to-use-group-policy-preferences-to-secure-local-administrator-groups/  <-- change the "local administrator" to "even log readers"

That helped me with adding network service to my event log readers group but how do I get a computer account to be added to the local group?   I tried %DomainName%\Taco but its not populating into the event logs readers group.  Any ideas.  Thanks for the first part guys!!