I have one of these pieces of art to suit my 1ggte. Does anyone know much about thses units? The car runs ok with it plugged in but what about the switches and dial located inside? From what I have found the dial can make the fuel richer/leaner but there are other swithces labelled Sw1, Sw2, Sw3 etc. Anyone know what these do? I know BD4's are spoze to be the only ones with the knowledge but someone might be able to give me a few hints