The people telling you that analog gauges are the way to go are feeding you a line of crap Jaydee. If your instrument has the resolution to do this sort of testing then it will pick up the oscillatory nature of the pump's action. The dP xmitter you linked looks pretty much like mine. You use a dmm to measure current (4-20 mA) which linearly corresponds to dP. Need good DMM to do it. You can probably find one that has LCD output as well for extra $$. Make sure you choose one that has the proper range for your test setup, eh?
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