Jay,
This is the site that I heard about
http://www.lectriclimited.com/mainpage.htm I cannot vouch for it until I try it. I remembered that I probably still have the old sending unit and I'll try it first.
Also, here in Lincoln there is an auto shop that rebuilds alternators and starters. I remember taking a starter there several years ago that crapped out on me and they fixed it right up. I'm sure there's an Alternator and Starter repair place in your area if you want to keep the original.
