I guess it would be handy to know whether the displays receive data direct from each of their remote sensors and then pass it on to the ECU for interpretation in terms of engine management, or indeed if it is the ECU that receives the data directly from the sensors, after which it then passes it out to the various instruments for display purposes.
Either way any break in comms either to or from the ECU would seem to add potential for confusion, though the hope might be that the ECU would be pre-programmed with fault codes to aid tracking down any such issue... But then... Perhaps not...?
More than happy for my thinking be proven entirely wrong... Again...Duh..!
