Old Cat/Truck with Edelbrock carb & fuel pump adjustment. Fitted relays & Maga fuses. Tandem Random?

Edelbrock adjustable fuel pump fitted with relay, starter relay fitted. Adjusting the fuel pump, Main & alternator mega fuses for safty, new ignition switch arrived and the driver almost got lost. On or is it An or is it Uhn? Tandem Random Redundant? ...---... Save Our Ship? Simple ignition switch wiring diagram.

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