Do your headlights work ??
If the guages don't work, then i'd check the connector to the cluster board. If checking that, a small hand can feel your way to see if it's loose. If the guages work, try the bulk head connector in the engine bay & the turn signal harness under the steerling column. Along with ground wires, it's just a process of elimination.
Chuck
There is a connector on the wiring harness that comes out of the steering column. It has all the turn blinkers, horn etc in it. If it has come loose all that stuff won't work. This is kind of a long shot but it is fairly easy to check versus a problem with the dash cluster connector or the acetate circuit board both of which are behind the dash and tough to check