In Codys GN we are using a 3 bar BUT just for his alky controller and also for the boost controller I will be making in the near future. both require to read boost in the over 15 psi ranges, since his car is turbo and will never see under 15 psi at full song a 3 bar is a must for these two devices. The problem again lies with the fact that the sensor is going to read about 2 volts to open atmosphere-no vacuum or boost from the engine, and you must have some way to scale in the vacuum end of the spectrum. A 3 bar map will read from 0-300 Kpa or up to about 29 psi boost over atmospheric pressure. It still uses the same exact 0-5 volt range as a 1 or 2 bar sensor but it must be scaled differently.
