With the drawings attached to the patent specification, can the same components in the same drawing be labeled with the same number, for example, can two ammeters be labeled with the number 1?

Yes, and it is generally required that identical parts in different drawings bear the same reference numerals.

In the same picture, it is best to distinguish the same components, otherwise the instructions cannot accurately describe them. For example, ammeter 1 and ammeter 2 are both described with 1. Of course, if the examiner does not point it out, he can ignore it. Just change the mark to a different one. It’s not a substantial defect. Don’t worry.