Problem with amplifying a pressure sensor for measuring blood pressure

Ok, finally had some time to sit down and check this out again.

It was definitely good to measure each item separately and check with a voltmeter.

I was probably wiring a couple of things wrong, and luckily it didn't seem to hurt anything.

The sensor was outputting -4mv with a null signal. Then the signal turns '+' for most of the output range. The datasheet mentions -40mv at resting, but in other places I've seen -4mv.

I only then connected up the INA122 and got up to nearly the 3.3V output. I was worried about the -4mv being amplified, but it seems to start from zero and go '+' from there. So, it looks like this combo works pretty well. Signal seems stable with me just blowing pressure into the tube.

Now, I'll pneumatically connect up to a blood pressure cuff and I'll post a pic of the pressure signal when I do. Cool!

I'll also update with my breadboard, I think I had some things wrong.

Thanks for your help.