Hiya @johnmiller ,
FusionAuth uses Hikari to handle connection pooling. I'm not familiar with how they interact, but this SO answer seemed useful: https://stackoverflow.com/questions/56581582/hikaricp-apache-dbcp2-and-pgbouncer
If you are using PgBouncer, then you definitely don't need HikariCP around.
But unfortunately, FusionAuth can't be configured not to use HikariCP.
Can you explain why you need pgbouncer and how that's helping you?