1、use google account login gtm
2、create one container, then get script, use same GTM code, put
<body>
<!-- Google Tag Manager -->
<noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-xxxxxxxxx"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<script>(function(w,d,s,l,i){w\[l\]=w\[l\]||\[\];w\[l\].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)\[0\],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-xxxxxxxx');</script>
<!-- End Google Tag Manager -->
different web site：A and B
So put it at two web site
3、Tiggers
．NAME： A page view
．Choose Event：Page view
．Configure Tigger：Page view
．Fire On：Page Hostname contains A.com
．NAME： B page view
．Choose Event：Page view
．Configure Tigger：Page view
．Fire On：Page Hostname contains B.com
4、add tag
．NAME： A ga
．Choose product： google Analytics
．Choose a Tag Type：Universal Analytics
．tracert id：UA-xxxxxxx-x (go to GA get website A’s GA code)
．tracert type：page view
．Fire on：Some Page -> find Tiggers：A page view
．save
．NAME： B ga
．Choose product： google Analytics
．Choose a Tag Type：Universal Analytics
．tracert id：UA-xxxxxxx-x (go to GA get website B’s GA code)
．tracert type：page view
．Fire on：Some Page -> find Tiggers：B page view
．save
5、Publish
6、Go to GA, see real time. If different website, see different real time customer~~
Now can open website A and B, see GA real time customer~~