HI, I want a device designed to control the voltage/amperage supplied to an HHO generator that will be used on large diesel truck engines. It must sense the engine rpm and/or load to adjust the amperage applied to the HHO generator

HI, I want a device designed to control the voltage/amperage supplied to an HHO generator that will be used on large diesel truck engines. It must sense the engine rpm and/or load to adjust the amperage applied to the HHO generator to control the amount of HHO being generated.
I have attached a description of the device that I want to design and produce.