Its the part that makes the tach work. It mounts to the distributer by 1 bolt i belive and a wireing harness attaches to it. I have no idea what its called (neither does shottenkirk) but its just like a little module with a hookup on it. Im not sure what it does , but it has something to do with the tach because mines stuck at zero. Its not a big deal i guess, just an annoyance. Maybe someone out there knows what im talking about. I had to get a whole new distrubuter a while back and forgot to take the old one off. Its for a 94 1.8 laser.
Also does anyone know if someone has a 92 GSX or TSi for sale in decent shape?