I started up my car tonight for a cruise and noticed that the right side of my speedo and left side of my tach lights are out. But my center clock light is ok. As are all my other gauge and dome lights. And the headlight knob dims and brightens them all ok too.

Is there a ground that could've come loose as I was taking my radio out 3 weeks ago and have some wiring just laying around back there? I haven't driven her at night in a while.

Most likely a burned out bulb.

You think 1 bulb would light up those 2 areas?

Probably one bulb in the speedometer side and one bulb in the gauge side. All the instrument cluster bulbs share a common ground.

Sergio, You might have pulled a couple of the sockets (bulbs) loose from the back of the gauge/speedo housing. You can reach them from under the dash to plug them back in or replace bulbs.