Turbo Boost Reading, Oil Pressure, Noisy Fuel Pump

[William_SWails@mail.amsinc.com]

     I just purchased an 89 200 Quattro, and I have a few questions:
     
     1)  The turbo boost readings appear to be wrong. At idle it displays 
     .3-.4 bar, at 4000 RPM it displays .7-.9 bar. I believe the turbo is 
     working as I feel a substantial increase in torque and acceleration 
     beginning around 3500 RPM. Any suggestions?
     
     2)  What is normal for oil pressure? When the engine is warm, the oil 
     pressure gauge reads just a little over 1 bar. When the engine is cold 
     it sometimes goes to 5 bar.
     
     3)  The fuel pump seems excessively noisy. Is this normal?
     
     4)  I want to replace the stock audio system with my Alpine CD player, 
     Dennon amp and Boston Acoustic speakers. Any tips or suggestions to 
     make this job easier are appreciated.
     
     Thanks,
     -Bill-