I have a 2001 western star and the gauges in the dash stopped working.

The databus wires that lead to the ECC. Then the plugs and pins that go into the ECC. That wiring diagram is the right one for your truck.

 

Just prior to this issue, was anything done to the truck, anything? Did you , or anyone check the ground circuit for the instruments?

 

On Saturday I decided to check all my fuses by pulling them out and putting them in. Yesterday night I start the truck and gauges dont work. I was like WTF. I could swear I checked everything. Checking again, nothing. I was about to run to computer and panicking create a new thread about my gauges stopped working.
But decided to check one more time. Sure it is, put the cluster fuse in the wrong location.
Whatever the problem is, good luck to you, OP. After experiencing the same problem yesterday, its definitely no fun.

On a side note, does anybody know why would my interior lights fuse burn when I open either door or just touch the red light switch? I would think there is a short somewhere, but its happening with both doors confuses me

 

If electrical work was performed immediately prior to this issue... here's your sign.

 

Broken/shorted flex wiring in one, or both of the doors, would be the first place I looked.

 

Think about it, just for second. No issues present, electrical is performed, now there is a problem. That has to mean something, don't you think?

I was not there to see what was done, how it was done, who did it, if it was done correctly( likely NOT since there is now an issue), and I am not there to see it presently. I am not clairvoyant and have only the info you provide in an attempt to offer guidance. You need to help yourself by putting some thought into this rather than camping on this thread waiting for a miracle.

Last bit of advice; isolate/undo what was done and restore the system to original...