First, a car has a network of electrical wires running all through. For instance, electrical wires connect the starter to the engine and this is why those who try to hot-wire cars require exposing those wires in order to start the engine. Others are used to connect the dash board gauges to the sensors placed on different areas of the car. In case your gas gauge is not showing and you have filled the tank, you should not assume that the gauge is faulty. Perhaps it could be a broken connection between the sensor and the gauge.
On the other hand, stainless steel balls have several different uses like in seat belts. They may also be found in constant velocity joints or in the anti-lock brakes, which prevent you from skidding off an icy road when you make an emergency stop. You should never see any of these while driving your new vehicle and if you do, you can be certain that something is wrong somewhere. The only time you should see this is when they are at the shop or while your mechanic is repairing the brakes or the joints.
Rubber gaskets ate found in the engine. These are simple rubber pieces that are found between all the metal parts in the engine. Mostly they are used in carburetors. These keep all the metal parts from rubbing each other and tearing each other out as well as ensure that all the seals are held tightly between these metal pieces. This prevents the liquid gas or oil from leaking out of your car. If there's such a leakage, it means that you may have a defective gasket.
Finally, there are other auto parts that you may consider. Those who work on cars see them as a network of wires, gaskets, stainless steel balls, etc. and this is why mechanics are able to see how cars work.
