Velocimeter problem

I have a megane 98 and something weird happens, when you go at constant speed and raise the accelerator's foot and accelerate again the speedometer (needles, km account, odometer) everything. In one of those it works again and then dies again.
Does anyone think of what can happen?
thank you

Does the ABS light come about?

If you do not turn on, the failure has you have it in the plugs that see behind the instrument frame. Renault usually makes the hoses too fair and that means that the plugs reach their miracle site.

If you turn on, the failure can be in the wheel speed captors since it is there that it takes the measure of the real speed of the vehicle based on the four -wheeled average.

Before it was much simpler, they wore a sensor in the gearbox.

All the best.

Once you pass the 3500 rpm, a yellow light is turned on, which according to the manual indicates electrical failure, when I work again and pass again the 3500 rpm goes out.
Where is the speed collector?
Thank you very much for the answer

You will have to take it to the workshop to put the diagnosis and to be able to access the memory of the vehicle's breakdowns, there is no other way of seeing what happens.

The car has four speed captrators, one by wheel and some of them are giving war.

Take advantage and go to the workshop make them check the circuit of the antiniebla lights because the portfusible holder and the cabin interconnection module are disassembled quite badly.

All the best.