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you need to use the harness and ecu for the same year motor...
basically when you do the swap what you are doing is just splicing ........ the gauge cluster to the ecu so the gauges work properly.. and the starter wire so the car starts.. other than that its just like the motor came in the car factory.....
but in cali if the car doesnt have the factory engine doesnt that raise a red flag for them?
Steve
We can legalize same year or newer motor as long as the car runs, passes emissions , and uses uncut harness. I was thinking to use a 2g motor so that the vin matches up. But since 89mirageman has a harness adapter for 1g engine harness to dash, I can use a 1g engine harness, use a patch harness for the right ECU just so things aren't so complicated in wiring the 2g engine harness to the mirage.