Help ID this Napa Echlin...thing.

It goes into my inherited "bad *** electrical tape wiring harness," and yes, that same harness has my temp gauge sensor coming out of it as well as going to the alternator. The "loose" fitting is the factory temp gauge wire, which has been bypassed as the gauge is bad. It lays there sadly and mocks me.

The entire thing is wrapped in electrical tape all the way back to the firewall, making it very hard to figure out. I was hoping someone would recognize it. I'm slightly nervous about just botching it off. I should probably shove my multimeter in there and see if there is any voltage, but I really dont want to **** anything up.

I'm not sure what my voltage regulator should look like. Could you try to describe or something? This is my first piece of old iron, and I'm still learning.