I searched on here and it seems to be the vss, but I want to make sure. When I turn the key to on, the tach jumps to 2000rpms-5000rpms, then when I start it, it pegs out. It's also pegged out when it's off. The speedo also does not work, along with the odometer. It's a 91 RS with a 305 and auto trams. Is this problem likely the vss?

The VSS has nothing to do with the tach.

Is the SES light coming on? If so, have you checked the trouble code(s) being set?

You may have a common problem in the instrument cluster or wiring to it, or you may have two different problems.

no check engine lights. thats strange. i wouldnt even know where to start

Cluster power, cluster grounding, damaged connectors/wires would be a good place to start.

My 90 model camaro rs is the same way and my security light is on as well. My tach showes 5000 at idel and goes up from there.. Speedometer doesnt work at all.. I have a 305 with 4 barrel and 5 speed transmission.. Help me too.

everything is working for me excpt my speedo and my odometer,, no check engine lights i guess imma start tracing wires

Make sure the speedo cable is hooked up to the transmission lol