4 Bar Map Sensor

[Flanagan, Stephen CECOM RDEC STCD]

Does anyone have and info on a company that sells a 4 Bar MAP sensors.
I am looking for the technical specifications of the output of 4 Bar
MAP sensor vs a 3 Bar MAP sensor.  Trying to lie to a DFI system and
use a 3 Bar fuel Map with a 4 Bar Map sensor.  Has anyone tried this?
My real concern is the outputs of the sensors, what does a 3 Bar MAP
sensor output and what does a 4 Bar MAP sensor output.  Is it a linear
voltage relative to the pressure?  IF so, what is the output range of 
these types of sensors. 0 - 5 volts????

Thanks in advance.  

steve 
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