I too have the same situation where I have a 40 bar (580psi) pressure sensor that works on a 4-20ma current loop.
I have tried 250 ohm resister across the +5V and analog input. But only get a 999 reading with varing pressure.
I know this is basic stuff - I must be doing something stupid, I'm a newbe!
Can anyone help??
(A kiwi under pressure)