Recover Deleted Project or Relink Google SDK

I have have Google SDK integration working fine for the last couple years. I mistakingly deleted the project on Google Cloud. Now i cant do anything with the integration. it just brings me to a
The OAuth client was deleted.
If you are a developer of this app, see error details.
Error 401: deleted_client
page. I have deleted all google coding in config. i have deleted all but 1 application credentials on home exept for 1 because
Application credentials in use by an integration may not be deleted.
I am trying to either bring back the project from Google Cloud or uninstall reinstall integraton. Please help.