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See my post #8 above. Vacuum, then dry nitrogen, vacuum, nitrogen again, the a overnight vacuum then charge. Change the oil on the two stage vacuum pump before that last vacuum pull as well. And use a micron gauge to see the real level of your vacuum. The gauges will read vacuum, but they can't read the last few microns of vacuum.
It is like wearing Belts, Suspenders, and Glue to keep your pants up. Maybe waste of time overkill, but you will never have too much vacuum, or too dry of a system.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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