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Hopefully this information can help those faced with and old rusted fuel tank and non working fuel gauge. 1987 Sunrader (1986 Toyota pick up) with a 26.5 gallon Transfer Flow fuel tank. After conducting test suggested by my friends on this site, I decided to drop the tank and remove the sending unit. I found it to be completely rusted with no arm movement. The tank feels solid although covered in rust inside and out. The sending unit appeared to be modified to accommodate the tank depth. I also removed the fuel pump and stand to get a better look at the interior tank condition. Couldn't see much, the baffle was in place and everything was covered in rust and sludge. This sunrader had been sitting still since 1998 when I rescued it from Craigs list. After removing about 10 lbs of nuts and bolts from the bottom, (someone had been drooping in the fill line) A simple cleaning was out of the question. I called Transfer Flow (still in business) To inquire about replacement. $1,600 because they would have to build a new one. Transfer Flow suggested a less expensive alternative "Gas Tank RENU" . About an hour a half away, I brought the tank and pump stand there. $660. to completely restore the tank and pump stand. Not bad considering the alternative. www.gastankrenu.com I was given a tour of the process and was very impressed. I pick up my Re-Nu tank Tuesday. In the meanwhile I ordered new gaskets and a new Toyota sending unit. I got the new sending unit and was surprised to see it was the same depth as the modified one. Although the tank is 15 inches deep, the sending unit is 11.5 . I'm not going to modify it. I'll just live with knowing I have about 6 gallons left when on empty.