No speedometer function due to ABS and TC tell-tales

Hello friends, I bought an Omega B Caravan for the pleasure of my father-in-law. Unfortunately it is very vulnerable. In the 2 weeks I have it it is only broken. Heating valve new, at Opel with installation 155 €, heating coolers flush 86 € and freeze I still do, petrol pump defective etc.. So, TC and ABS light very often sporadic, thus no function of the tachos and the systems as well as the power steering. Sometimes it works and the lights are off. The lights turn on to great shocks and everything falls off. I suspect somewhere a wobble contact, but where ???? Can someone help me here from you, I really hate to work for a car. Thank you so much, I am totally disappointed, although I like to drive by car. Please say hello Sebastian