KS, An auto parts store should have a copper tube kit for exactly this purpose. I think I got one at an Advance Auto store. The copper should be more accurate and less prone to failure than plastic that typically comes with the gauge, although I have used both..when I was a kid and broke, it was a plastic tube thru the firewall to my gauge set on the '78 Civic. On my current project car, a '91 Civic, I 'upgraded' to copper when I installed an OP gauge.
And yes, you'll want to bleed it so you don't have air in the line, which could affect accuracy.