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Sir Duane Jones . . . . . . .
You gave us no model, but is this it ?
That specified part is color marked up on both schema and parts list.
Quite a special little slide switch there, with its 3 positions and do note the cross jumper used on the middle terminals, should you opt to use another switch.
But don't let the marked in ends specified 75 A fool you, as that is being relevant to the secondary of the transformer power handling, and its short time delivered power.
A 10 amp AC rated switch would work fine there and over in the 2 amp mode portion . . . .that little switch end would be asking . . ."Are you turned on yet ? "
STAAAAND WAAAAAY BACK ! . . . . . . .Here it is . . .
73's de Edd