I have a 94 Discovery 3.9L. After wiring the stereo, I encountered many issues that I worked through. After installing, I eventually found that my dashboard Lights went out. This could be due to either messing something up while wiring or my ground popping off that while the car was on. I'm not sure as I didn't drive the car at night for a while so i necer noticed what could be wrong with the dash lights?

Check the fuse first. My dash fuse blew when the water pump gasket was leaking.

Update: after checking fuses they were all fine. Now both taillights on my right side went out. I replaced the bulbs and neither work but, they work when I use the brake.