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it's in the tank. on your 1980, you will unscrew 4 screws securing fuel door to the body and remove fuel door, and rubber underneath fuel door and around filler neck if your car still has it. then you will see there is a 3/8 and a 1/4 fuel hose that lead off to the passenger side of the vehicle that need to be undone the plug for the sender, and I think there is also a 1/4 vapor hose that leads off to the drivers side that also has to be undone. pull the bolts around the filler neck and remove fuel sender. install is reverse removal as always.
the smart man will use a blanket or a fender cover to protect the body and paint on the area between the fuel door and the rear of vehicle so when you are removing the sender you don't spill fuel on your paint