Final answer:
The best source to learn about the gauges in your car, such as the fuel and temperature gauges, is the car's owner's manual, which contains detailed information on all gauges and their functions.
Step-by-step explanation:
To find out more about the gauges on your car, the best source of information is your car's owner's manual. The owner's manual will provide detailed explanations for all of the gauges, including the fuel and temperature gauges described as voltmeters in a 1996 Volkswagen. These gauges register the voltage output of sender units which should be proportional to the amount of gasoline in the tank and the engine temperature. For more comprehensive information on your car's performance, such as fuel efficiency or vehicle weight, you would need to look at specification sheets or databases that provide this type of data for new cars with an automatic transmission.