If you are missing the RPM tach lead on your pump, and are feeling adventurous, you can try adding one yourself.

Scroll down this thread and take a look at the instructions in there for adding the RPM lead to the circuit board.

http://www.xtremesystems.org/Forums/...=234698&page=2

I believe his was a Vario in that thread FWIW. If not, he also mentions that Laing could do it for you if you send the pump in..