Hi yes there is a connection but that becomes redundant with the fitting of aftermarket shocks, the old cure for that was bridge the connector with a diode so it thinks its still working on some cars you don't even need the diode, its like the conversion I did on an old Jaguar Sovereign after installing the twin angled conventional shocks with the new brackets I had to cap off the reservoirs and feed pipes but because the sensor was not receiving any info from the reservoirs it thought it was stopped permanently, no warning lights. They were all pretty simple systems but not that reliable as they can't follow the dynamic travel of any road the same way as a conventional shock will, they are great if you want to drive round at 30mph everywhere, if you ever have a mind try Bilstein B6s they are like travelling on rails.
Steve.