Vintage Cars: MB 380, ac units, computer issues

Question
How expensive is it to repair/replace the airconditioning and Odometer. Neither is working on a car that is for sale and I don't know anything about these cars. Car is pretty to llok at but I don't want to pour money into it. It has 91,000 miles and it appears it may be available for 7,000.

Answer
Sorry so late to answer, had some computer issues
The odometer is easy and can be done providing you have  a donor dashpod, these are available on ebay and other sources.  AC is a whole other matter.  You ddid not indicate the year of the 380, several years had issues with the AC units as they were vacuum driven by a troublesome servo.  If this is the issue the fix is very expensive

Let me know year and service history, some 380 models need to be avoided...
Ron