Piezio Gyros vs Mechanical Gyros
Generally, a piezio gyro is better than a standard mechanical gyro in the sense that it doesn't have any moving parts, and it's more sensitive to the movements of the heli. However, they are typically more expensive as well.
A new type of piezio gyro have recently hit the stores. Known as the heading lock gyro, this gyro is capable of maintaining the heading of the heli even in strong wind conditions and thus allowing you to fly in any direction without the head or tail swinging about.
Field Equipment
The field equipment you require will depend largely on the type of starting mechanism for your helicopter. If you have a glow motor with a recoil pull-starter, you will only require the basics of a fuel can & pump for carrying and pumping fuel to your heli, and a glow plug igniter to supply current to the glow plug during starting.
If you do not have a pull start, in addition you will undoubtedly need an electric starter powered by a 12 volt battery to turn the engine over. Making a flight box which contains all your necessary field equipment is a good idea!
Other Accessories
Since the helicopter is purely a mechanical device, tools for assembly usually include items such as screw drivers, ball drivers, nut drivers, wrenches, pliers, fuel-filters, addition glow plugs etc. In addition to these there are a couple of specialty tools that come in handy when assembling and setting up the mechanics of your helicopter. One tool you may want to consider to assist in assembly is a set of ball link pliers. The ball link is the most popular linkage piece on a helicopter and virtually all choppers use them. The ball link pliers greatly assist in the removing and adjusting of these links. A second tool that is extremely valuable during set-up is the rotor blade pitch guage. This device can help you line up your rotor blades so that your pitch is correct. A blade pitch guage can go along way to helping avoid costly crashes and frustration down the road as so much of your chopper's well being depends on how well it is set up initially and maintained throughout its lifetime. Of course, last but not least, glow engine fuel, which is normally a mixture of nitromethane, and lubricants like caster oil or synthetic oil. Helicopter fuel are normally 15% nitro, although you might like to use 20% for more power for aerobatic flight.

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