They are exciting cars to drive when new and depressing when old.
The electrical panel is in the front passenger seat area and notorious for getting wet, rusty, inoperative and disabling random circuits on the car. The 928's production span 1977-95 roughly coincided with my tenure as an electrical/electronic editor of automotive shop manuals. :-(
Here's how the panel should look when new or in a car that never gets driven hard in weather.
Here's a typical used car.