Update -
A day later and 50 miles into the tank - the sensors woke up and my guage said I had just about a full tank.
Scheduled an appt with the dealer took it in with a little less than 1/4 tanks
They looked it over - found 'no problem', cleared the fault logged in the computer - and sent me on my way.

Well I filled it up last night - guess what - same problem!!
Back to square 1. Since I'm still under warrenty and service - back to the dealer I guess.