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No, there is not really anything to change except the gauges. Most of the OX66 engines use a Smart gauge package that has fuel consumption, etc. built in. The shifter control will work. I would also add a water separator in the fuel line like a Racor if you don't already have one, the fuel injection system is very sensitive to water and dirt. Otherwise it should be a straight bolt on as long as the engines are the same shaft length.