1. Blown fuse. The first thing you should check is the fuse that controls the instrument lights. If the fuse is blown, replace it with a new fuse of the same amperage.
2. Faulty switch. The instrument light switch may be faulty, preventing power from reaching the lights. Check the switch for any damage or loose connections, and replace it if necessary.
3. Wiring issues. There could be a problem with the wiring that supplies power to the instrument lights. Check the wires for any damage or loose connections, and repair or replace them as needed.
4. Faulty instrument cluster. In some cases, the instrument cluster itself may be faulty, causing the lights to not work. If this is the case, you will need to replace the instrument cluster.
If you are unable to find and fix the problem yourself, you may need to take your vehicle to a qualified mechanic for further diagnosis and repair.