Aftermarket gauges?

If routed and installed correctly, I have never had a plastic oil line failure on my cars with a mechanical gauge. I also use the stock oil warning light, gets your attention faster. I have however seen copper fail from work (vibration) hardening. I will say that it happened in a harsh environment, engine shut down in an airplane from prop stop. Making a pigtail between engine and firewall helps , but it will eventually work harden anyway. I then switched to stainlsteel braided line for oil. Stainless line for my fuel primer lines, but no more copper for me. Agreed, your car is not an airplane!