Speedometer signal (second)

Hello.
had asked last week how to
- I'm gonna go check the speedometer.
After 'numerous' answers, I did it myself
The European Commission, DG XXIII, has published a report on the

For all who care:

DC voltage:
10-12V DC
(to see if there is enough voltage)

AC voltage:
0V AC with standing vehicle
2V AC at approx. 50km/h

For higher speeds I was missing the passenger.

It looks like the impulse between
+12V DC and -12V DC changes and depending on the
Speed an increasing AC voltage
==References==