[ischmitz]

Well, depending on what accessories you got with your LM-1 you might have to spend some money to get it to read/log RPM. The standard LM-1 only comes with the O2-sensor and the cables to power it.

For RPM you need the RPM converter and depending on what signal you plan to use an inductive clamp. The RPM converter is something like 99$ and the clamp another 25$.

BTW: There is a newer version of the LM-1 called LM-2 out that fetches RPM readings off the OBD-II port if you car has one. Interesting for newer cars but not really useful for pre-993 cars.

Ingo