I am going to be running the PLX boost gauge which has a 3 bar map sensor. Would I be able to use the analog out on the PLX for the MAP sensor for my PFC?

 

It would be difficult as the PFC looks for a bias differential between ground and a constant 5V supplied from the PFC with the stock MAP giving from about 1V to 4.6V and about 2.6V being atm (1000 Kg/m^2 to 24000 Kg/m^2). The 3 bar PLX analog out would be 0V to 5V and about 1.6V at atm with a pressure range from about 1000 Kg/m^2 to 43500 Kg/m^2.

I cannot think of a way in the DL to align the 0 to 5V PLX out to what the PFC is expecting (1-4.6V). For sure you would need to change the PIM scale offset for the 3 Bar and maybe align the voltages in the Map reference Boost to RPM scale. Still don't know what you do for the lows and highs (missing 0-1V and 4.6-5V)....

The best solution is to add a 3 bar map sensor rather than use the PLX output.