What could be wrong dash lights flashing and gauges bounce of zero repeatedly.

Hello, As you know, Jaguars are notorious for electrical issues. Many people have been able to resolve this issue by replacing the instrument cluster, but many other components and control modules can cause this issue, apparently. You will need to bring the vehicle to a technician who is ASE certified for electrical systems. The link below will show you all of the certified shops in your area, who have the equipment and staff to complete this diagnosis and repair: http://repairpal.com/jaguar-within-10-miles-of-covington-tennessee-38019