I have a differential pressure gauge built around a Honeywell DUXL01D.
Measuring 0 - 1" H20 which is the same range that I've seen used on the
old 80's repogle systems and in Dick Johnsons tests.

At the moment, during testing I'll be using an analog meter, my
amplifier outputs a signal between .6 and 4 volts. Ultimately it'll go
into an A/D converter on a digital system I have.

Ian