Technik

Sometimes minimum get crazy and after a few engine is off. And even if it's gone off, the rpm counter continue with its crazy moving and I can listen to the gas pump working even if it don't have to. I think this could depend on an electric contact. But where can it be? I see next to the diagnose connector, 2 cables. One goes to the rpm counter, but I can't see where the other goes. The cables on the centralina look ok. Can anybody help me?