Yea, to know what machine works with what engine you actualy have to test it or look into the files. Currently there's 2 forms of power, Electric Power and Mechanical Power. The pumpjack needs electric power, SteamGenerator - ElectricPower InductionGenerator - ElectricPower ElectricGenerator - ElectricPower CombustionGenerator - MechanicalPower Windmill - MechanicalPower Waterwheel - MechanicalPower