It does read at about to 11 psi if you trick it....like with the AFC hack or with a chipped ECU that's it. A chipped ecu scales the tables down.

 

Not sure exactly what you are trying to say. The map sensor will read positive pressure, regardless. The problem is that the ecu won't. If the gm won't even measure positive pressure, that would pose an entirely different problem already. But I can't see why it wouldn't You could always use a different map sensor, right? Bah. I have the hack and now I want to chip my ECU. I think that is the way to go. Wish I was obd1

 

how bout a GM 2bar MAP i KNOW that one reads positive pressure.

 

Yep that one will, and I beleive thats the one that comes with the GM supercharger kit. Regarless I dont think it would work on my system without the ecu being reflashed to understand it. Apparantly I cannot do the reflash because my car is a 96 instead of an 00+

 

why? you can chip obd0