You might find a sending unit at a dealer if your VERY lucky.
They have been NS1 for several years, but if your dealer will do a nation wide search you may find one.
Also you may find one on eBay, they turn up from time to time. But you will pay dearly for it.
If you cant rebuild yours, or if its not just a bad ground (common problem) as a last resort you can add an aftermarket one to the tank, but it will require you to use a hole saw, and add a hole to the top of the tank. Be sure to order the ford/mopar style to get the closest to correct ohms for the factory gauge. 73-10 ohm.
http://www.tanksinc.com/index.cfm/page/ptype=product/product_id=276/mode=prod/prd276.htmhttp://www.amazon.com/Jaz-Products-378-2...ASIN=B002RLCOD6For the tank, either a salvage yard, or local sale.
