I know there are how too's and I followed it. My question is: The MAP sensor (the only sensor left that needs to be plugged in on the how tto) has an o ring on the bottom like it's hooked to a vaccum source? I just put the new engine in and I do not see what would plug into it! Also I could not find a vaccum line coming out of the firewall other than the boost gauge for the vaccum canisters. Any help would be appreciated.