Cant really help you with the fuel gauge, but if you run a few tests with your multimeter you should be able find out whether it is a dodge fuel sender or gauge. fuel senders work with resistance, so checking what sort of resistance/ohm's your sender is reading would be a good start.
as for the door lock, you can not get another lock of another car, neither can you purchase one of ford spare parts as you would have to change all of your door locks/bootlocks and even ingnition barrel. Sometimes if the lock is not badly damaged it is repairable.
hope that helps
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