Update, i went to a electrician and asked him to check and change if needed the two capacitors near the cooling plate of the ECU(i’ll add picture). So he checked them change one and now i get proper duty cycle at pin 3 and ground, don't use (pin 2 as ground mine doesn’t work).
All good now i can start to fix the ke jetronic system, i get 60% which i think means either failed potentiometer or car speed signal. Either way i count that as a victory for me as a person with no experience nor education in this field. All you need to fix this car is a DMM, internet and some common knowledge.