Hello,
The ISSUE, the dash/instrument panel lights will intermittently turn off on one side of the dash or the other, or both (Tach, etc. OR Speed, etc., or both), other lights in the car are unaffected. They will resume functioning in an arbitrary manner, with no repair. Turning lights ON or OFF, turning the car ON or OFF, hitting bumps, temperature, duration of drive time, weather, or towing a trailer seem to be unrelated - having no effect on precipitating or resolving the light failure. Lights may remain OFF for seconds, or minutes, or days at a time (making night-time driving problematic when the speedometer is out.) The instruments themselves work fine, the only problem is the lighting.
Thanks.