My speedometer,Tach, Gas guage, temp guage, windows all lost.

Sounds like you need a new car.
With joking aside, the problem with your speedo, tach, gas guage, temp gauge and odometer can probably be one of two things. Check your fuses. If they are fine you may need to replace your cluster panel. I had to have the entire thing changed over my speedo not working right. It was not cheap. You might want to check the relay box under the hood. Does your transmission leak? Check the fuses and relay on it also. Get a new ignition switch and replace the old one if your key is stuck. You can try WD40 on that key but don't expect any miracles. The bearings are likely shot. Sorry I posted all of this bad news. Good luck.

you have lost ground to the dash and or steering column, use a ohm meter to search for open circuit

You have to remove the under hood fuse / relay box and disassemble , check for broken / corroded wires in the harness plugs at the bottom and broken solder joints at the board. I have repaired many of these for the same problem. hope this helps

sounds like the main fuse has blew which is under the hood

http://www.youtube.com/watch?v=HPvX190txvk

Had same problem with my 2000 dodge stratus 2.4 liter and transmission would not shift out of 1st gear. Solution was ignition fuse under the hood was blown, one side of fuse working, replaced 10 am fuse everything works, tach, speedometer, gas gauge and transmission started back to shifting.

Try disconnecting battery for couple minutes and see if it starts working again I have done that in the past

check your ingitoin switch (the key) did it to me on volt gauge wouldnt work ding go dead and check guage light would come on

That Cluster will work But, You will have to get an Installation kit if you want the Tach to work. Everything else will hook up the Same. You have a Distribution Box (Fuse Box) Under the Hood on the Drivers Side, There is a Fuse in it for the Speedo. Inside the Cover to the Box is the Fuse Diagram or in the Back of the Owners Manual.

sounds like the computer has a glitch. you might need to go to the dealer to have the computer trained(reprogrammed) or to see if you need a new one.