My car "was" a 1990 190e 2.6, automatic. Now it is a 190e 3.0, manual. I have installed all of the 2.6 running gear except for the throttle body, which is 3.0. It has taken quite some time, but I have just picked up a 1990 300TE engine computer. Right now I am using the 2.6 computer just to drive the car around the neighborhood because I am worried about the engine getting too lean at high RPM. Should the 3.0 computer be a direct drop in solution? Is there something I am overlooking? I was told by my MB dealer to be sure that it is a 1990 3.0 computer because of frequent changes in those years. Looking around on the web, it looks as though the O2 sensor might be different. Any help would be great.