I have the turbox mbc and lost the instructions. It has marks around the **** and o mark on the main part that doesn't spin. How do I know how many psi it's dialing in? Thanks for any help or a link with the info.

 

I would like to know too

 

Most MBC's do not have a set psi per turn or anything. You just turn it slightly and see it reflected on your boost gauge. Please god say you have a boost gauge on a FI set-up.