Well, this is clearly not the way to go.
Even with the supercharger installed you will have moments (the great majaority) where the engine is running without boost, so overfuelling all the time.
Furthermore, when running with boost the map sensor cannot measure it, as it is a 1-bar version and may introduce a fault code and limp-home mode.
What you need is a good after-market ecu and wiring loom, with for instance a 2-bar map-sensor.