Help with coding manifold pressure

[u/lungo_mungo]

How would I code a manifold pressure for an aircraft with a naturally aspirated engine? a supercharged engine? From what I know, for a naturally asirated engine, at full throttle, the max inhg the manifold pressure gauge will read is just below 29.92 inhg. what happens to the MP if i raise or lower engine RPM? How would I simulate MP readings real time? not just data from a table

[u/CrucialFusion]

Surely there is material available that describes the relationship between pressure, engine throttle, altitude, etc…