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Thank you, Gasguru. There is only a pressure gauge upstream, but that does drop on starting one of the pumps. I've also managed to get the compass meter working. The compass has to synch with the rotor, so starting the motor with the compass held over the bleed screw means it speeds up with the...

We have 2 x circulating and 2 x shunt pumps (for redundancy - we live in an old council building). Please could you advise the best way to find out if a pump is rotating or not? Any of the four pumps running will vibrate the others, so vibration doesn't help. I tried this little compass device...