I am hooking up boost gauge today and couldn't find steel so I got 3/4'' to 1/2 and then 1/2 to 1/8th to hook up my boost line to gauge. I was hoping some of you would say you have done this with no problems but if you think its going be a problem please let me know. Thanks in advance. CD

Brass will work just fine.

Got steel and brass both... Steel 3/4" to 1/2"Brass 1/2" to 1/8"

Guys how tight do you tighten the ferrals on the plastic line for boost? I just don't want to over or under tighten them Thanks CD