It's the successor to OBD-II. Controller Area Network. Basically everything talks to each other over a CAN bus. Think of it as a networking protocol for all the computers in the car.
One of the problems you would face is that there is no way to drive the 8G/3G/2G instrument panel w/ the 4G ECU as it's CAN based. The ECU spits two wires out to the cluster and relays all info that way. The 8G/3G/2G have direct hookups from different sensors / senders to the cluster, many of which are eliminated in the new engine. For example, the 75 MIVEC only has one coolant temperature sensor where the 3G/3G/2G has two. One for the computer, the other for the dash.
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