Dashboard Light just went out yesterday. How do I fix them?

Did you check to make sure you didn't accidentally hit the dimmer switch?

Follow up. I'd grab a volt meter and try and find what point your losing the voltage at. It does sound like a fuse seeing that everything is out. While this might sound painstaking I'd suggest going through all your fuses to make sure none of them are blown. I've seen plenty of cars where a fuse for something unrelated blows and sends a bunch of things out. Sometimes the factory just did a crappy job with wiring things in proper circuits and sometimes the owner before you does some funky wiring. It could also be the dimmer switch itself. If that went bad it could send all those things out. You'd have to jumper the connections to figure that out. I'd tell you how to test it but I have no clue how an Astro is wired.

In the old days..when I was a car mechanic--the dashboard was lit by tiny light bulbs pushed into special sockets..there was NO screw-in bulb--it was a glass and wire bulb that slipped into the socket/

Most times it would be a matter of feeling around up-behind the dashboard to PULL-the complete Socket--out..the socket is a 2-wire(meaning)the ground is attached/

Yank out the bulb and replace with an identical bulb..then re-find that sockets location in the rear of the Dashboard..

Its difficult but not impossible.

It sounds like your instrument panel voltage regulator is bad.

it can be a cheap part or it can't be, I don't see it being more than an hours labor.