surfer_crx:
I noiced that you move the lcd.setCursor instruction from the setup to the loop, why did you do this? I know your way was the right way of doing it as I moved it back to see what would happen and it just printed a figure to every character space on the LCD.
The reason for this is after writing the value to the LCD the first time around the loop, the LCD cursor will be at the end of that, rather than at the start of the 2nd row where you need it, so this resets the print location each loop() iteration or your values will simply be printed off to the right out of view on the LCD.
It's a bit of a shame "Manifold Pressure" is a character too long too. Though I can't think of a worthy abbreviation 
Geoff