0V output from sensor will cause check engine light.
5V output from sensor will cause check engine light.
You want the output to the PCM
to be between .4 and 4.8 volts.
If you "fool" the PCM
into thinking that the MAP
is higher than actual, you will defuel at a lower actual boost reading.
I assume this is for your E99 truck.
If you had a 95-97 truck, the MAP
output is frequency based and these tips wouldn't apply.