I have been told by BMW, who have apparently checked with ALPINA, that the E39 B10 with tyre pressure sensors all have the wheel type which has the tyre valve in the rim (by the tyre) and NOT in the centre under the locked cover. They say that only the wheels with rim mounted tyre valves have the required sensors built into the wheels, and they can't be fitted to the other wheels. This sounds strange to me as I can't remember seeing any B10s with rim mounted valves. Can anyone confirm or deny this? Does anyone have a fully WORKING sensor system with the centre mounted valves for instance?