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Can you declare press in global scope (right before loop) and modify:
void doDisplayInstantCurrent(){displayTripCombo('I','M' ,instant.mpg(),'S',instantmph(),'C','M',current.mp g(),'D',current.miles());}
to
void doDisplayInstantCurrent(){displayTripCombo('I','M' ,instant.mpg(),'S',instantmph(),'C','X',press,'D', current.miles());}
and see what you are getting for press in the lower left corner?
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