I have 2 toggle switches on the left in my 70. Top one is for the aux/main fuel tank registry for the fuel gauge.
The lower switch the PO had hooked up to a rear aux light, which I have since hooked up to my electric fuel pump, which is also pulling power from key on only, so Idon't need to flip the switch every time I start/stop the vehicle, but only in a trouble situation.
Switches are located between the manual choke pull.