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So if the volt meters speaks CANBUS, then the whole system is CANBUS. Seems a bit overkill to canbus a volt meter, but it does not really surprise me. Now that I think of it, if a had a truck with an ECM, I might carry a pre-programmed spare. My experience with ECMs has been not great. Don't...

Oh ok, so he is just trying to get the speedometer working. Thought he had a dead CPU board.

I have never looked at one on a military vehicle, but usually there is a central CPU and small cpu's in various aspects of its operation. Look for a box that is similar to the C7 or 3126's ECM. The box may be heavily shielded, if it is EMP proof. In a car with CANBUS, for example, the operation...

I can read these signals with my Picoscope if it is CANBUS. If there is no signal, the whole board typically gets replaced.

Ugh! Can bus.....