My 2006 buick terazza wont start no click no gauges power everything else works

Never "bypass"! Always make repairs. "Bypass" means you're defeating a safety measure. Indeed, hands on testing is needed. If your battery is fully charged and has been tested and is able to sustain a load, then there is a cabling issue or a fuse issue. Hands on testing basically is needed. Nothing to guess at or suggest other than testing to see where the electrical power is lost. www.repairpal.com/repair-shops