To answer pauls questions:
1. This is the sensor I'm using from digi-key:  MSP6800-ND
2. It's 0-5 psi guage.
3. All I need to detect is any negative pressure at all (so very low
res.)

Thanks for the advice dwayne, but I need really low res and sorry my
error on the '627 mistook the comparator.

My new ideas are:
1. Using the circuit from the following url and an 16C711.
http://www.linear-tech.com/pdf/2053i.pdf

2. Or using the 627 and a ADC0831.

Opinions?

Thanks,
Aaron

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