Fixing old Miller Roughneck 2E

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Got a 1980 Miller Roughneck 2E last week. It is tired but the 14 hp Tecumseh doesn't smoke, just runs like crap. Carb is worn out from vibration. Have new float ordered as the hinge holes on the old one were about .030 to big from wear. I set the valve tappet clearance at .011 exhaust and intake. Spark plug looked fine. Thing I'm wondering is, that model used a set of microswitches on the throttle linkage, which by the way has long since been replaced with something else on mine, to switch between weld and power modes. From the wiring diagram and guessing I'm thinking that the microswitches exposed more windings to load when the engine was set to run at 1950 which is the 115 volt power RPM. When the engine throttle was flipped over to run at 3600RPM which is the welding speed, the switches reduced the output of the 12 volt charge circuit and the 115 volt power circuit. 2 ThingsA prior owner wired an additional open / closed toggle on the control panel which controls the power circuit, but left the 12 volt charge circuit switch down on the engine. Cleverly they removed the throttle linkage which operated the microswitches so that the circuit was always in the weld mode.Question: Has anybody run into this problem before, and what were the solutions that worked, short of trying to find (NA) parts to replace the ones originally designed to work off the throttle linkage? What is the best type of switch to use if I am going to replace the throttle actuated switches with toggles on the control panel?