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What are you trying to accomplish by adding the CANbus system to the older vehicle? If you want to plug in a ScanGauge or something similar, you will need to add a number of sensors in various vehicle systems, or tap into existing sensors. Or fake up those sensor readings.
If you want the complete OBD-2 vehicle diagnostic capability, you are going to have to add a whole lot more sensors...
And that's before you even get to the data protocols and all of the other stuff that you need to make things talk to each other.
If you only want fairly straightforward information displayed digitally, it makes more sense to tap into the sensors directly, and have the Arduino display the readings to you. Much simpler that way, though still a fair bit of work.
If all you're looking for is MPG info, then the MPGuino is what you want.
-soD
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