I don't remember where I got the sender, possibly Ames or OPGI. The sender looked very well made. I don't remember the brand. It looked almost exactly like what came out. The original looked in terrible shape and worked only sporadically, even after checking and cleaning the ground. It was, however, more accurate when it worked.
You're right, 2 gallons isn't that much and I'm not worried about that, I just want the gauge to register full when it's full.
Yes, I'm getting 10-12 MPG. It's pretty much impossible to keep my foot out of it. If I wanted a car to keep my foot out of, I'd buy a Toyota Pious.