You have a 1996 Chevy corsica with 80000 miles both the speedometer and the fuel gauge don't work what could be the problem?

It could be a couple of things. Depending on the type of cluster it could be a couple of burnt out light bulbs (easy and cheap fix). Also, it could be that your cluster is dying (expensive fix). If this is the problem try a place through the internet called Mr Whizard, they rebuild instrument clusters ($200 - $300) verses a new cluster ($1000+).