Well worst case scenario, you can put in an M50 asc. I'm not sure if it's different, but that should work. I have asc on my late model OBDI '94. I wanna take it out though lol.
1998 BMW 328is - summer
1993 BMW 525i - daily
1994 BMW 325i - sold
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold