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I acquired an 86 F-150 that had been parked for a couple of years and due to the ethanol gas, the tank and sending unit were rotted out. The truck was a factory 300 6cyl so it was not fuel injected. From a little research, it appears that they changed the sending unit hole in the tank in 85 to accommodate the fuel pump in the tank and since the non-fuel injected fuel sending was made for 1 year plus the 300 in 86, I could find no one that listed it. I ended up buying a tank and sending unit for an 84. Can anyone tell me if there is a resistance difference between the 84 and 85/86 non-fuel injected sending units? If there is a difference, is it as simple as getting a fuel gauge out of an 84 to make it read right? Currently with a full tank it is reading half but with all the other hack jobs that have been done on this truck I don't want to chase a problem that may not exist.