 <p>you can use the <code>series</code> <a href="https://developers.google.com/chart/interactive/docs/gallery/linechart#configuration-options" rel="nofollow">configuration option</a> to change the <code>targetAxisIndex</code> </p> <p>the documentation says... </p> <blockquote> <p><code>targetAxisIndex</code>: Which axis to assign this series to, where 0 is the default axis, and 1 is the opposite axis. Default value is 0; set to 1 to define a chart where different series are rendered against different axes. At least one series much be allocated to the default axis. You can define a different scale for different axes. </p> </blockquote> <p>but seems to work without assigning anything to the <em>default</em> axis... </p> <p>see following example...</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>google.charts.load('current', { callback: function () { var data = new google.visualization.DataTable(); data.addColumn('string', 'Label'); data.addColumn('number', 'Amount'); data.addRows([ ['Label 1', 10], ['Label 2', 20], ['Label 3', 30], ['Label 4', 40] ]); new google.visualization.LineChart(document.getElementById('chart_div')).draw(data, { series: { 0: { targetAxisIndex: 1 } } }); }, packages:['corechart'] });</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://www.gstatic.com/charts/loader.js"&gt;&lt;/script&gt; &lt;div id="chart_div"&gt;&lt;/div&gt;</code></pre> </div> </div> </p>