Quote Originally Posted by karl_eller View Post
I believe that most pumps (eg a D5) have RPM sensors identical to the RPM sensor on most case fans, so you could just plug the RPM wire into one of the fan headers on your board, and monitor the RPM there. The CPU fan header is a good choice, since most motherboards keep an eye on that by default, and put up warnings when the RPM drops below whatever the set threshold is.
I believe that SpeedFan can be set up to make a warning when selected fan headers drop below a set RPM, too.

Eller

I know you can hook up DDC pumps to a RPM sensor but I don’t think you can do that to a D5