I worked with avionics manufacturers and in the avionics repair shops so I can and do repair all avionics on my cessna 182 airplane myself. I can fix any avionics on my plane. I have service manuals, toos, test panels and special test equipment. I never worked on instruments though that is why I asked the question about the instrument. I do some minor repairs on the instruments though too e. g. I change the bulbes in the instruments, replace instrumets filters etc. And no one will ever convince me that I cannot do this.
Yes, I can! 
If you can not do this kind of job you MUST send your avionics and instruments to the repair shops. I am sorry for you that none of you cannot do this kind of work. For now I am just wasting my time explaning the things to people wo have no idea of what I am talking about
