I will try answer in English language because it might be easier to translate into Hungarian language.
In principle - assuming factory Kadett GSI 16v or 1 to 1 conversion into another carbody - it does not matter what distancy frequency generator (DFG) you have installed because the BC receives its information on fuel consumption, remain tank contents etc. from the ECU or directly from the measuring gauge for its calculations. You need it only to get the right speed information in your tachometer (I assume the LCD) and average speed.
In case of the LCD you can change the DFG used from 6 to 16 by the switch at the top middle of the LCD. You can use any DFG except the ones marked with "AD" which is for automatic gearbox because you do not need the speedo shaft, only the impulses. When using the 6 impulse variant the LCD should show 125 at ignition, otherwise it should be 127 for 16 impulse.
You can find additional information on this subsection of the website ascona-info.de (in German only)
http://www.ascona-info.de/LCD-Tacho.html
This website might help also in other cases because the oldschool Opel like Kadett, Ascona etc. are similar in their simplicity and conversions like motor swaps are still well-established
Hope my response will help you?
Best regards