Koslov,
I got your pump today. I'll get it tested on Saturday.
Do you mind if I play around with undervolting it? I'd keep a fast blow fuse on it, so risk would be minimal. (If anything happened to the pump, I'd get you a new one, but it might take longer to get back to you.)
Depending on undervolting results, I could probably put a speed control on it for you. I'd make sure the circuit started the pump above 11V to ensure that it got started, before dropping back to a lower voltage.
There's even a genuine Radio Shack sound level meter at work, so I might be able to get noise level measurements at different voltages.
Also, depending on what kind of transients it puts out, I may be able to give it an RPM output.
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