Masospaghetti wrote:
> ...
> Why are they called "death kits"? because they often put too much oil in
> the system or because the gauge is not accurate? or both? ...

Both, and that you're only seeing the low side (and often not very
accurately). Also, they're often used to convert older R-12 systems to
134 and most people don't do it right...they just let out all the old
R-12 (if any's left) and then add the stuff in the cans. Not evacuating
and flushing the system and not replacing the drier and not knowing how
much oil is in it will often result in a dead system...usually
compressor failure. And, if you connect the can to the high pressure
side it can explode with dire results.

If you continue to just add gas to the system you have no way of knowing
how much (or what kind of) oil is in it (or how much gas is in it
either). The only way to know for sure is to start with an empty,
flushed, and evacuated system and add known quantities. At least get a
decent set of gauges so you can monitor both sides.

Look here http://acsource.net/acforum/ for lots of helpful folks & good
advice.