What if you try this:
20kPa = 0.204V = 41.8 as InMin.
250kpa = 4.896V = 1002.7 as InMax.
About zeros, I dont have the knowledge of Arduino to tell if it matters. I just love them. 
What if you try this:
20kPa = 0.204V = 41.8 as InMin.
250kpa = 4.896V = 1002.7 as InMax.
About zeros, I dont have the knowledge of Arduino to tell if it matters. I just love them.