What do the TAB, TAD, EGR and EEC-IV talk about? MegaSquirt? I am attempting to swap my thunderbird over to a MegaSquirt fuel injection system and I am wondering how the EEC-IV controls these valves. I would like to get them working off the MS fuel injection computer so I can retain emissions equipment (trying to be as 'green' as possible) but don't know how the system really works (and no one seems to answer me on the MS forum). Can anyone here assist me?