Map switch boost levels

[Emil__123]

Can someone tell me how to use map switch for only different boost levels ?
I don’t want Flexfuel or anything only different boost. I have a map that is good but right now I adjust boost with gfb3 and want to have one map for 28psi and one for 15psi but can’t figure it out.

 

[carabuser]

If the gfb3 controls boost then you wouldn't be able to do anything with boost target from MHD map switching.