Engine 
To dream about an engine signifies your heart and its strength.
To dream that your engine is destroyed suggests that you are about to or have been taken advantage of.
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.
Reapers
To dream of reapers working hard augurs happiness and prosperity.
To dream of an idle reaper means your path to prosperity will be met with a series of obstacles.
Tractor
To dream of seeing or riding a tractor indicates your inventiveness and creativity.
Jackpot
To dream of hitting the jackpot is an indication of a wonderful idea burgeoning within your unconscious mind. To dream of lights flashing and coins flowing onto the floor suggests that you have all the ingredients necessary to create an abundant and enjoyable life. To dream of a casino or gambling hall filled with the sound of other people's jackpots going off implies an underlying fear of lack even though your life may be rich with abundance.
Scanner
A scanner in a dream represents an exchange of information. This dream may also indicate that you are repeating the ideas of others.
Vehicle
To ride in a vehicle in a dream represents your life's speed and direction. Refer to particular vehicles for more detail.
The driver of a vehicle in a dream represents the person, or the aspect of yourself, or a part of your life, which is in control of your life's path. For example, to dream that your boss is driving you around indicates that your work has become the main factor in your life decisions.
To dream of falling from a vehicle indicates that you feel out of control.
To dream of crashing a vehicle represents a self-destructive action.
Gambling
To dream that you are gambling indicates that you are being risky. You could be avoiding responsibility by placing your hopes in fate or luck.
If you are not a gambler, then this suggests that you should trust your destiny and take a chance. Ease up.
Windmill
To dream of a working windmill symbolizes the great power of your mind. It may also indicate the current state of your emotional self.
To dream of a broken or idle windmill implies unknown and unexpected obstacles in your path.
Engineer
To dream about an engineer indicates that you are controlling every aspect of your life. It can also suggest that you are pondering a circumstance and the way in which different aspects join together.