Someone on Rangerovers.net has done it via a relay. The second one was in the spare wheel well mounted on a bracket at the side of the spare wheel.
If you have got a problem with the system though both compressors could still be running all the time and you end up with two knackered.
If you have got a problem with the system though both compressors could still be running all the time and you end up with two knackered.