Understand unit of measure of MAP

[DonMizzi]

Hi, I write here for a newbie question.

I tried to inform me online but I still have some doubts about read graph of MAP.
I have a Civic eg with K20A2 NA, Pra, Kpro4, Kmanager v4.1.5.

For MAP sensor, my default unit is "/psi (this is inHG/psi ??)

I saw that there are various units (bar, mbar, psi, inHg, inHg/psi)

In my ignorance, I do not understand how inHg / psi is a unit for pressure

Someone can help me?

Can I use mbar, that probably I read better, or there are any advantages to using inHg/psi?

Thanks for help
Don

[Spunkster]

in/psi is commonly used in the US. It means that it reads in inches below atmospheric pressure and in psi above atmospheric pressure. You can use any of the units that make the most sense to you.