If a car needs a new ignition switch, does it have new keys for it? on 1993 Saturn SW2

was told a new ignition switch has to have new keys Had car worked on, new ignition switch, but still uses old key. I was told if it didn't have a new key, then the man didn't put in a new switch, whch Ididn't think was wrong to start with. Also, what does the sender do for the car? Told it makes gas hand work. New one put on but as hand isn't working. Thanks for help

yes new ignition means new keys the sending unit is in your gas tank