Filling/Emulating HAL data in Android Automotive with hikey960?

I’ve build Android Automotive OS for hikey060 which is already running.
My next step would be emulating rpm or speed of vehicle - but how to fill that data into HAL android automotive?

Do someone have an idea?

I believe that this is what you are looking for: https://android.googlesource.com/platform/packages/services/Car/+/master/tools/emulator/