More information would be a good thing...

Your truck runs while it is doing this right? It does it 'off and on'?

Just off the top of my head, it would seem to be a loose connection in the dash, or a fuse. Pull the panel in the truck (under the steering wheel) and take a look at the fuse for the instrument panel.

You might try posting in the electronics forum if the fuse thing doesn't work. You'll get far more knowledgeable people responding. I'm limited to just "keeping the evil black smoke in the wire" myself.

BTW: a 2000 SE isn't all that big of a deal