where/how does our engine/ECU figure out engine vacuum from the intake manifold???

and what sensors are used to messure that???

 

should use a MAP sensor (Manifold Absolute Pressure)
will be a small wide flat sensor bolted to the intake manifold

but our cars have a MAF also (Mass Air Flow)
the air temp sensor is also part of it, sits right behind the air filter and measures the amount of incoming air

anything else??

 

i think that should cover it...

still all this new age tech. is still jumbled to me i'm still used too the old school way non ECU, carb and all the good stuff pre-72 era haha but thats just me