How many times should your gears be shifting in a 1975 Mercedes?

There is no definitive answer to this question as it depends on a number of factors such as the driving conditions, the type of transmission, and the driver's personal preferences. However, as a general rule, you should shift gears whenever the engine reaches its peak torque or power. For a 1975 Mercedes, this would typically mean shifting gears around 3,000 to 4,000 rpm. However, if you are driving in heavy traffic or in mountainous terrain, you may need to shift gears more frequently to keep the engine in its optimal power range.