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There is no dipstick. If you open the power steering tank on right hand side of the engine, there should be a gauze screen under the filler nut that is about the length of your middle finger and the oil should be up to the bottom of that screen.
As said, no dipstick just look in the top of the reservoir on the RHS of the engine.
Lift the gauze screen out and check to see the condition of the fluid as well, you may need to dump it and put fresh in (depending on what they have used in the past).
Fill it up, exercise lock-to-lock a few times and top it off to just under the gauze