Why not get a good vacuum pump fesigned for the job instead of doing
slack work with the wrong machine. $30,000 fine and 5 years in prison
if one of your customers turns you in for venting. Triple purge and
evacuate USED to be legal, but even then you were supposed to use a
DEEP vacuum pump. Your manifold gauge cannot measure a deep vacuum,
they are not accurate and the resolution is too low. Get good tools
and instruments. Of course if you are doing the work for yourself,
maybe you deserve the results.