okmed wrote:Did the orifice take the twitch out of the analog reading ?

No, it didn't seem to - just reduced the pressure reading overall. I'm going to double check the data sheet on the sensor and make sure I didn't miss anything in setting it up. One thing I noticed, is that I've got the tube hooked up to the "low" side, rather than the high, so I'm getting a negative pressure which I then invert to a positive. Not sure there is a high or low side anyway or if it matters, but I'll probably just switch it around because... seems like I should.