Hey, new here. And new owner of an 1987 FC. That car is stock, really well kept and got 85.000km (I’m from Belgium)
I recently changed my reverse light switch, and I noticed my rear fog light dashboard light was ON which was weird since it wasn’t ON, on the taillights. After messing around to see what was going on, I noticed the dashboard is inverted (Light indicator ON when light is OFF and OFF when ON)
do you have any suggestions for what I should look at?

thank in advance