Hi. I need electrical wiring diagram/schemes for 2012 Mercedes Atego 916. I need for instrument cluster, tachograph...

Problems:
- speedometer in instrument not work
- digital speedometer on display not shows/not working
- tachograph no work (no light .. nothing)

I've scan with diagnostic tool and here are fault codes:
- 1520: CAN bus to tachograph has failed // no signal from the module V FR/Drive Control IC // CAN line failure or interruption between tachograph and instrumentation
- 4345: Speed signal has a break or short circuit to ground or short to contr positive.
- 0162: Can "Signal V" message from tachograph is wrong
- 3620: The electromagnetic valve MKUE1 has an interruption.