380SL (107.045) V8-3.8L (116.960) (1982)
With vacuum >0.585 bar, needle of indicator should be at left hand stop, with vacuum approx. 0.4 bar at beginning of red field.
If so, a leak in vacuum system of light range regulation and/or air conditioning system is indicated.
Repair leaks.
If on vehicles with automatic transmission a vacuum control unit on transmission is defective, oil may also be present in indicator and its line.
Clean line and renew indicator.