Really?? Well then what am I thinking of? There was definitely something like this that could be done. A sensor that could be adapted with new wiring from a 325 to a 328 and it was much cheaper.
1998 BMW 328is - summer
1994 BMW 325i - daily
1992 BMW 325i - totaled
1988 Mercedes Benz 190E 2.3-8V - sold