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1) There are two types of R134a service port adapters:
A) Without schrader valve, uses a push pin.
B) Steel, with its own schrader valve.
The "B" is the preferred in a straight configuration. You do not need 90's.
Be sure you have removed the existing schrader valves from the compressor's
R12 service ports.
If you are cutting the o-ring in the R134a adapter then either leading edge
of the R12 service port fitting has a sharp angle or burr, you can remove it,
and don't overtighten the R134a adapter, it just needs to be "snug".
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