I was at the Blaser Auto website today and saw that they are having a sale on sending units for $89.50. They advertise that they fit 1978-88 Gremlin, Hornet, Concord, and Eagles. I've had good luck dealing with Blaser's so anyone in need of a sending unit might want to check it out. It's listed as the sale of the month so I don't know if its really for April or it was for March and they haven't updated their web site. Here is a link to their site:
http://www.blaserauto.com/index.htm