That is the pump for the rear air suspension.
I would say the biggest size rims you should put on a 1994 Chrysler Fifth Avenue or a New Yorker would be 20 inch rims.
Unlock the doors with the key.
It is inside the fuel tank.
In the glove box
In the front passenger fender well
Unlock the driver door with the key.
Front passenger side.
It is on the passenger side of the transmission bell housing.
Mopar ATF +4
power distribution behind battery.
It is screwed into the exhaust manifold on the rear of the engine.
It does not have a mass airflow sensor.