First of all I'm not used to hearing the term "electrics." I'm willing to accept it as valid, but what should the usage be? Is it a synonym of "electronics", or "electricity", or something different?
Right now I don't see anything with electrics that I think merits the existence of the tag. Everything in there should really be tagged with something more useful (like avionics, instruments, electrical-system (none of those yet?), electric-aircraft, or personal-electronic-devices), and most of what's there already has a more appropriate tag.
I'm not universally opposed to having an "electrics" tag, but it doesn't seem to add much over the more specific tags and I can't think of a situation where it would be used without needing a more specific tag.
There are two separate things, I think:
electrical systems -- everything from the generators to the batteries, circuit breakers, lights, etc
electronics or avionics -- anything based on transistor technology, GPS, engine monitor, etc. I would even include a cavity tube-based transponder
There has been more than a little talk in the media lately about the possibility or inevitability of electric powered aircraft in the future. Perhaps this tag is more appropriately referring to electric powered aircraft. The tag name could be edited to make this clear but I would love to see some more discussion about the possibility of clean, quiet power plants.