ok the mechanical oil pressure gauge came with the nylon tube, but i was wondering should i get the copper one or stay with the nylon tub??

 

ive always used copper lines with my mechanical oil pressure gauge.

 

Another option(one I prefer) is SS braided lines, get the mobility of the nylon line without the fear of tearing and spraying oil all over the place. Only Time I would use copper hardline would be if the gauge was external(mounted on hood or cowl).

 

ya id use stainless too.. but im a broke **** so copper is golden to me..haha