How do I reinstall my gmail account onto my new iPad?

How to add a Gmail account to your iPad's Mail app

1. Start the Settings app.
2. Tap "Passwords & Accounts."
3. Tap "Add Account."
4. Tap "Google."
5. In the pop-up window, enter your Gmail email address and then tap "Next."
6. On the next page, enter your password and tap "Next."
7. Start the Mail app.

if you want to download the gmail app, then you will have to go to the app store and download it.

hope this helps