Got an American Autowire update but they don't offer fan speeds??

[smoknbarrels]

So I updated my '67 C-10 with the AAW update kit, but they only offer a high speed for the heater fan (I have no A/C) and my truck has the 3 prong switch for 2 or 3 speeds, anyone know how I can keep the 2 or 3 speeds? Or should i say - add it to my system, I really don't want just the high speed only.
I've never ran the truck before, so thats why i dunno if its 2 or 3 speeds, i still have the old resistor mounted on the heater box too.

How does it work? Is it just a simple loop to the resistor somehow?
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