Oil pressure idiot light stays on

Copper's work hardening trait is easily dealt with. Put a few loops or coils in the tube. The larger, the better. This spreads the 'work' out over a long distance and radically decreases the hardening at any given point. GM did this for decades on their mechanical oil pressure gauges in their pick-ups. Never heard of one of those failing, ever. I have seen and heard of the plastic lines failing. No thanks.

If you really want robust, break out the wallet for some -2 AN/JIC hose & fittings.