A memory from early childhood was when we looked into the cars, if you could reach up, to check on the speedometer what top speed the car might have. At that time, it was common for the last digit to be 120 or 140 kmh on ordinary cars such as SAAB, VW and Goggomobil. If you saw 160 you were impressed and if it said 180 you got excited. On motorcycles, it needed to be at least 180 to impress.
At that time, it was believed that the top speed was the one that was on the meter. When you then got old enough to drive yourself, for example. 175 cc Silverpilen, it was found out that the speedo needle never reached the last digit. After a few more years of stories about how fast Yoy had been, the term "optimistic meter" was also discovered.
Even though we now know all that, Black Shadow's speedometer is just as iconically impressive.
The picture also gives the right mood now that the autumn darkness is here. I'm guessing that Jimmy C is somehow involved in this picture as well.