DUMB MECHANICAL OIL PRESSURE GAUGE QUESTION

All I have ever run is the plastic (nylon) and never had an issue. We even used it on the track and no one ever said a word. I always run it along the wiring harness and zip tie it every few inches. I keep it away from anything hot and sharp. I have however, seen copper line break and it had more than one loop in it. If you don't want the nylon line then I would go with braided.