Unfortunately, it sounds as if one of the bulbs are burnt out inside the instrument cluster. You are going to need to get a book to help guide you in repairing this problem. You can buy a book at an auto parts store, or you can go to the Library and take a notepad and pencil with you.
The odometer light fuse also controls other lights on your instrument panel. The odometer light can be removed by removing the instrument panel cover. Push the light bulb in and turn at the same time. The light bulb will come out. Replace it with a new light bulb.
remove dash replace bulb(instrument cluster)
instrument panel or controls?
There is another fuse box under the hood and next to the battery. This fuse controls the horn, dashboard lights, and the tail lights.
lights for dash heater controls
You have a blown instrument lights fuse or it is just turned off. There is a rheostat that controls the brightness of the lights. Find it and adjust the brightness.
Should be parking/tail/dash lights on a common circuit
You can't just replace the lights you would have to replace the whole control cluster.
Try the fuse box, prolly a burnt out fuse.
The tripmeter knob located near the odometer on the instrument panal can be rotated left or right to accomplish this.
Cluster means all the gauges and warning lights on a vehicle i.e. fuel gauge,temp gauge speedometer, odometer, oil pressure warning lights etc.
Check your fuses for these devices. Or while under the dash you have accidentally unplugged them.