Whilst there are systems out there that can read all that sort of data from certain ECUs through the OBD I socket, because OBD I isn't actually a standard system, the amount of data that can be read for each engine is specific. For my E30 BMW, I'm having to build my own datalogger, and using a Fusion Brain, a few potentiometers, and some cable splicers, I'm getting speed, tacho, fuel and coolant temp for a hell of a lot less than $179!



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