Originally Posted by
NielsGalan
I had a similar problem after I bought my car. RPM gauge and econometer only worked on and off, mostly off. After a lot of trial and error (LONG story) I found out that is was the coding plug that had a lot of bad solderings.
Inside the coding plug (mine at least) there is a chip attached to a print plate. Several of the solderings between the two were cold, causing the connection to be bad. I had all the legs from the chip re-soldered, and it has been fine since. My car is older and has a different engine, but possibly you have the excact same problem.
Good luck.
Niels