would like some input please.
What type of a switch is used for the fan motor on / off in a 49pickup?
->
Here are aftermarket 6v & 12v heater switches. They are sold by most restoration parts vendors.
can you use a toggle as the heater has a temp control
-> yes (some GMC trucks used a three-way toggle switch)
or maybe a high/low type switch to control the speed,
-> yes
