Machinery 
To dream of machinery signifies that you are passively going through life and not actively participating in your own decision processes. Machinery in dreams can also indicate that some aspect of your life may be in need of attention or repair.
Yantra
To dream of Yantra is a symbol of the greater workings of your waking life. A spiritual quest may be about to dawn on you.
To dream of Yantric symbols and Mandalas is a reminder to be aware of the details. Keep your heart open to further understanding and a deeper spiritual purpose of your life.
Tractor
To dream of seeing or riding a tractor indicates your inventiveness and creativity.
Mechanic
To dream of a mechanic indicates that you are nursing old emotional wounds that should be tended to. You need to move on in your life.
Watermill
To dream of a watermill is a reminder that you always have options. By carefully considering a particular problem from each angle, you may find a new solution. The watermill may also serve as a reminder that slow and steady progress towards your goals is the best course of action.
Instruments
Musical instruments in a dream represent harmony. Technical instruments are symbols of your work or an emotional state which you associate with those tasks.
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