2 blogs, 1 database, shared users?

Hello, I’m attempting to add 2 wordpress installs to one DB and use the same wp_users & wp_usermeta.

I have successfully added 2 installs to 1 DB and I have successfully made them use the same user tables. In the main install the super admin works and all is normal however in the secondary install the admin account isn’t able to use super admin options and I only have access to profile. It’s as if it thinks it’s a subscriber account.

So what I’m asking is, does anyone know how to make it so the one account is super admin on both installs. Or how can I make another user and make it super admin on the second install?

Thanks.