A speed signal to which I measured 2-10V depending on the engine speed. on the 0.3 bar oil pressure switch is new and has passage to the AI .
Now I had even replaced my AI from one another 4 broken elkos Cold soldering points removed but still no working tachometer...

Has anyone ever built a 4.2 AI in a preface lift 3.6 I know pin occupancy is slightly different but did the rev indicator go???
I slowly feel that the newer Motronic emits the speed signal differently and the old AI can't do anything with it.
Can I pick up a direct speed signal somewhere?