It's not as easy as you're asking... First off, forget about psi. That means nothing when you're talking flow rates. There are way too many variables to even begin the calculations.
You need to start with the displacement of the M90 which is 90 cubic inches or 1.5 cubic liters. Then you need to know how fast it is spinning (per minute). Then either way, you'll have to convert to cubic feet per minute. Then you need to know what the VE of the M90 is at any given rpm. I'd love to have this equation, but I don't. That will determine actual flow (as close as you can get in a relatively simplified way) in cfm. Then there's some places out on the web that will roughly convert cfm to kg/hr or maybe lbs/hr. It gets it in the format for what your EEC/MAF reads. Then you can find out what information you are looking for.
I made a spreadsheet that calculates a lot of that, but for you application it wouldn't be of much use. If I remember right, I used a very simplified 85% VE for the M90, but that changes with different models.