I just purchased my first audi

its a 1991 200 turbo sedan, the car runs great but ofcourse has some issues.
when i drive the speedo bounces up and down and my odometer wont work, then after awhile the speedo starts working and the odometer starts working. i read about the IC needing to be re-soldered ? that will fix my odometer also? the odometer and speedo both are electronic ?
second problem.. my blower motor for the heat and a/c wont come on. i checked the voltage at the wires that go to the blower motor and it changes when i change from hi to low on the electronic control inside the car, sooo.. is my blower motor bad ?
thirdly.. LOL.. i think its my heater control valve... there is a vac line but its been cut and i cant find where it should hook up if someones got a pic or something that would be great.
there is a after market cd player in the car, i have the factory cd changer in the trunk is there a way to hook it up to the aftermarket cd player ??
lastly... whats the overall opinion on the 200 turbo automatics, reliable, junk, or what ? what are these worth in running driving condition ?
sorry for all the questions..
i would appreciate any help and its a great site..

thanks.. PHil