Working/burst pressure of copper tubing

[tech.35058]

While repairing some leaks on my NH LX865, I have become aware that the charge pressure monitoring switch has been deleted from my machine. ( yes it is a raggedy old machine).
My 10,000 psi test gauge indicates an engine running charge pressure of about 350 psi, the manual specifies to "(check with a gauge capable of 600 psi)".Spec is 250-500 psi) I am too cheap to buy the factory switch ($80-130?), & try to figure how to wire back into the "(Electronic information center -EIC?)" which has a failing display. I can get a 600 psi gauge via Ebay for about $15. Now to mount it in the operators compartment. I had in mind to use hydraulic hose adequate for the relatively low pressure for the flex portions of the route, but I was considering copper tubing for the straight or non flexing runs.
Copper tubing should be fine if engine oil pressure , 40-120 ish psi, but never? for hydraulics. But would 600 psi be within working pressure, or should I go Hydraulic hose all the way? I have plenty of worn & deteriorated hyd hoses in my life already.

 

[Fabricator]

Maybe this will help. Working pressures are going to depend on diameter and type of copper tubing.

 

[Sapientoni]

I suggest using hydraulic brake lines of the appropriate size. I worked in industry with pneumatic cylinders and a lot of them on every automated assembly machine. Some processes required an air pressure booster to press parts together. This boosted air from the plant source of 8 bars to about 10.5 bars. Standard plastic air lines are only good to about 120 psi. Some clown used 12 mm. standard line on the supply from the booster to the press in device. The line eventually failed and it sounded like a shotgun, The operator almost flatfooted jumped over the machine. No one was hurt but it could have been nasty. Copper is not rated for hydraulic usage much beyond the 1/8" line to the engine pressure gauge, I believe. The vibration and wear factors also come into consideration.