I had a simalar problem with mine. Not enough voltage at idle. was only getting .2 also. Fuel maps can read below a .5 I believe. mass air might be slightly to large for stock. Im not sure how he got around it but it took some time on his part, and I still have the same meter. He might have increased the idle speed to get the volts up if that makes any sense. Sorry no help here but he did make it work somehow.
88lx Conv. 200K mile stock longblock. Trickflow intake, 42lb inj, Pmas protube,TKO500, 3:27, pypes muffs, Pa Racing tubluar K-member, DIY single turbo setup. Summit aluminum rad, Crane Hi-fire ign, subfames, 17" sc saleen's, Saleen ground effects, SCT tune by Dynosport. 380HP 435ftbs.