Deep135 - Have you looked at the Hoagies Gifted Education webpage?
There is a link dedicated to psychologists administering tests to assess for gifted. https://www.hoagiesgifted.org/psychologists.htm
These psychologists would be expected to be familiar with the DYS eligibility and testing criteria - https://www.davidsongifted.org/gifted-programs/young-scholars/admissions/eligibility-and-testing/.