Have just talked to Russel at Miller Commercials and he is going to try and dig out part numbers for me at the weekend but from memory he said they are BMW X5 parts and are a sensor strapped to the rim with a big jubilee clip and not valve based.
BMW apparently gave up on them quite quickly as they were too sensitive and always giving false positives for pressure drops. He said in his experience it was usually the central monitor which was the main culprit and where it was positioned in the S1 with all the heat didn't help its lifespan. He thinks I may be letting myself in for a whole world of pain reinstating it as it will probably drive me nuts but will try to help with the tyre sender units if I decide to go ahead.
I'm going to try and check the pcb on the central monitor this weekend to see if it's still alive before deciding if I will just replace it with and external monitor with new valve style senders.
Morgan fitted both styles of sender- both the big jubilee clip version and the valve mounted version
