So i tryed funola's egr thing and its not working out for me and was wondering if its because i have an 85 tach with the 3 prong in back. or because i was misssing a ground because i soldered the 12v part in back and did the red and black wire pair and put that in.

__________________
1974 240d
1983 240d -sold
1989 420sel with om606
1994 s350 turbodiesel - sold