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Longhornmail,
I guess rubber hose is OK if you check periodically. It has a tendency to rot in smoggy and hi-heat environments. I prefer copper for instrument lines, because of its longevity. I was refering to that clear plastic or nylon line that comes with some of the less expensive aftermarket gauge sets. It gets brittle in the above conditions and cracks. Not good for vacuum, worse for oil gauge.
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