Coyote,
I've got a custom set up. I took a Ford Ranger knob set and panel which had to be cut off and modified it to fit the hole in the dash. The switch I hooked to a set of 3 relays which is wired to the heater blower motor. I made a custom heater controller with a small PLC. You may not want to do that. Perhaps it would be better to locate the pull cable under the dash. Most people do that because hooking up the crappy heater controller is unreliable anyway.