The following are the steps which I have used to set SASH version 1.4-rc1 up against Oracle 11 and Oracle 12 instances:
git clone https://github.com/pioro/orasash.git
cd orasash/sash_dev
create sequence fakedbid;
  to repo_schema.sql to allow SASH packages to compile
grant select_catalog_role to &SASH_USER;
  to repo_user.sql to allow the V$INSTANCE over DB link query to work
@config
@target_user_view_XXXX.sql
  (XXXX as applicable for database version)
GRANT SELECT ON sashnow TO sash;
or (l_ver = '12.2')
  to the sql_stat definition in SASH_PKG.get_sqlstats