Originally Posted by
pizzaguy
The SPeedo is driven by the Brake Controller, it gets information from all four wheel speed sensors in order manage the stability control. However, it drives the speedo with data from the front two only.
I dont know why this is, but thats what the dyno guys say.
Well if they claim its the front I guess L6/1 aka the left front wheel sensor is the speedometer signal from that diagram I posted is the most likely culprit.