Answers: check the fuse panel and see if there's one speckled instrument panel i think on that one their is,if so check the fuse and see if it have blown,also check the ground wire for this Chevy's have a problem with keeping ground wires on things the one you will be looking for is grounded to the steering column,and afterwards it grounds to the body,good luck on it.
Check the fuses, carry a shop manual and see if the power lead going to it and the ground wire going to it are right.Check them with a experiment light.
If it is a solid state circuit printed type(more than feasible is0 then you may enjoy to replace it.The speedometer will come out of it or may not be part of it.
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