[dcb]

Sorry, eco, I don't understand your comment, your graph doesn't seem to go negative.

re: code, since you have a scope, I would simply display the injHIus value on the guino while scoping a couple injector pulses and compare the injHIus per half second duty cycle with what you calculate from the scope, and see how far off it is.

You might want to sample some other pulses at the high end of the pressure gauge/rpm scale to see how small that gap might get.