I want metal tubing not plastic for my oil pressure gauge!

I was washing my 1965 Barracuda the other day and when I passed the sponge across the area around the wipers where I have a mechanical oil pressure gauge installed (on the outside cowl right in front of my field of vision) the plastic line snapped off. Well, that portion of the tube is always baking in the sun and the plastic probably became stiff and weathered after a few years. Has anyone found where to purchase the old style metal line that used to be included in the mechanical oil pressure gauge box? I want to upgrade from plastic before it happens again. Thank you.