Twingo C06 Tacho shows 0km/h despite changed encoder

Hello, My brother bought a Twingo C06 Bj. 2002 with a 1.2 16V engine. On the transfer ride everything worked for approx. 200km normal. We got into a traffic jam and twice the engine simply went off. After we left the traffic jam again so after approx. 30 minutes we accelerated again, but the speedometer stopped at 0km/h and the KM indicator also didn’t count any more. We called a friend who then drove the 30Km until home. Ing the speedometer twice for about a minute. I have arrived at home first realistic 3 hours researched what could be the cause. Most had the problem with the speedometer. Good Tachogeber bought and tried to install. With the capped lay already in the hole where it comes in. We removed this piece of plastic and made the new one, test drive and neither Tacho nor Km counters moved. Now we have the question what it could be, because All fuses are safe, plugs are where they should be and cable breaks as far as you can see are not visible. The funny thing is that after the traffic jam at once it didn’t work anymore but 200 km in front of it perfectly. What else could it be? Besides, these works are like encoders etc. change with the 1.2 16V engine very cumbersome because you have so little space. Who has an idea please report as soon as possible! Thanks in advance MfG c06driver