To send Custom Dimension data with an Analytics Pageview tag, what do you need to add to the Pageview tag in Tag Manager?

To send Custom Dimension data with an Analytics Pageview tag, you need to specify the Custom Dimension's index number within the Pageview tag settings in Google Tag Manager. This index number (e.g., dimension1, dimension2) uniquely identifies the custom dimension you've configured in Google Analytics. Without this index, Analytics doesn't know which custom dimension your data corresponds to. The Tag Manager account ID and Analytics property ID are configured at the tag or variable level, not specifically for sending custom dimension data. A JavaScript push method is used for sending data to the data layer, which can then be used by tags, but it's not directly added to the Pageview tag itself for custom dimensions.