From the status bar menu, go to "Accounts to Sync" where you can select the Gmail and Mac accounts that you would like to synchronize.
- Gmail Account To Sync
- Sign into the Gmail account that you would like to sync, and grant the app access to your contacts.
- Mac Account to Sync
- This app will sync both your Google contacts and groups with your Mac as long as your Mac has either an iCloud contacts or "On My Mac" contacts.
By default, the Mac account is set to "Auto" (recommended). In this mode, if you have an iCloud account, your iCloud contacts will be synced with Gmail. Otherwise, your "On My Mac" contacts will be synced with Gmail.
You can also set the Mac account to "All." In this mode, all of your Mac contact accounts will be synced with Gmail with the exception of any read-only accounts such as Facebook.
In addition, you can select one of your individual contact accounts such as a "On My Mac" account, an iCloud account, or most any other type of account.