Recently my truck picked up a new quirk. When I start or stop the engine there is a static scratching noise that comes from the dash. I also tried turning the key just far enough to get power and gauges and that produced the noise as well. My best guess at this point is that it happens when the gas gauge goes from empty to actual level when power comes on, and then again when it goes to empty when power is cut. Radio and climate controls are both off.
I can't exactly tell if the noise is mechanical or electrical. It sounds a lot like crackling static or sand paper across a hard surface.