Constrain all of your parts so that they move correctly! Just move them around as you constrain them, delete/edit the constraints that don't work, and ask for help if you need it!!
One way to constrain your piston:
Create a point on the center of your piston to use as a reference for constraints.
Create a plane through the center point of your piston and parallel to the gears:
Use the plane that goes through your piston to make an axis.
Looking from the top view, make the axis out of an intersection of a world plane, and the plane that runs down the center of your piston.
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You should be able to use the same drive that you had for your gears, to drive your entire piston assembly.
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