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speed control for steam engine

I need someone to design a circuit for me. It is a speed control for a 25hp steam engine. I already have safety featured built into the mechanical design. This speed control will operate a 4 amp 12 volt linear actuator which will operate the steam valve adjusting steam volume into the cylinder. The circuit needs to be 12 volt. I need an RPM controlling rheostat and a rheostat also for a sensitivity/delay control so the valve isn't moving too much for every little change. RPM of the engine will be around 150 + or - 10% is good. A magnet can be placed on the flywheel and a magnetic pickup sensor can be used unless you have a better way.
 
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