If you are into DIY, you can also buy a new Rheostat and solder it on. I did this on mine, and it's been working fine for several years. I took the Rheostat off an NOS sender I had bought off Ebay ( not an FI sender- jsut the regular one). But I later found this place where you can buy the parts.
http://tristarrradiator.com/Products Page/Products Page.html
Robert, I installed the new unit discussed in another thread.Watch out there's a lot of post here about this. I'm still waiting for someone who has found a drop in without tweaking the sensor. Mine shows full till 1/2 tank the reads anywhere from 88 to 71 so when it starts this I fill up . Sure would like to replace it but if I have to bend the rod it will never read right again just like the one in the bathroom tank run run run. Hope you find the correct one.:beer: