2005 Tahoe Limited edition 4x4.

Wife called from work cause battery dead. Used a jumper to start. All gauges
in cluster not working. Power locks and windows not working. Heated seats
not working.
Drove to a local shop that has worked on other stuff and checked fuses.
Alternator is charging. Shut it of to see if would start, and it did, and the
tachometer and speedometer are now working, but nothing else.
Any ideas before I wind up having to dump a bunch of money into it. I know
electrical is a big weak point on this year of Chevy.
I said LS model but not sure. It came with what they called a Regency
package. Lowered, body molding, nice brakes, graphite dash, 20" wheels
and tires, limited badges.