Speed Manager auto. gear

Hello friends
speed sensor / sensor in automatic transmission vehicles is not there?
206 cc full otm. In my car today, the speedometer did not work for a moment, then it came to myself.
May I have your opinion on friends who are knowledgeable about the subject.

If you say speed sensor on the gearbox, someone says km reader, but there is such a piece, there is a problem in the indicator, but it is usually the first km reader that comes to mind. It is something that happens after 120,000 km of friends with 406, this flat gear does not matter automatically, I think the life of the part is so I think I will change the sub-industries around 50-60 TL for the originals between 130-160, I have done research for it, but I am definitely for the use of the original parts.