It's not the best way but I've had some success with charging R12 based on the sight glass. Just enough to remove bubbles and make it clear.

Cloudy? I'd be concerned that the dessicant in the drier has gotten loose in the system.

__________________
Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386