Check the fuse in the back of the instrument cluster. It looks like a bulb-holder, but it is red in color.

Also, you can check the plastic-encased diode toward the rear of the fuse-box assembly (near all the relays). If you open it up, test the diode, and just replace the diode from your nearest electronics parts store (e.g., RadioShack).
If it is dead, be sure to replace in the correct orientation.

:-) neil