ECMlink 1g dsm 3 bar map not reading

[turbojo]

Ok my GM 3 bar map does not fluctuate with RPM's or boost it just stays the same I tryed a friends 3 bar map sensor and it did the same thing this sensor worked fine the last time I used it but I went back to a stock maf and now that I went back to sd the map doesn't work right so its something with wiring or tuning I tested the wire that's got 5 v going to it and it has 5 volts running to it how do I test the other to wires

 

[hotrodssnova]

One is a ground and the other is a return to ecu. The return should read between 0.5 volts and 5 volts. Apply a small amount of air pressure and it should change the output voltage.