Thanks for the comment Funola. I like the idea of the OE rotary switch location. Only one question. The original OE switch serves two functions. One it controls the air flap door via a cable and 2nd it allows to the fan speed selection. Removing and replacing the switch should not be a problem with building a mount for the dial, but any suggestion about the vent flap ?

As mentioned, I've ordered new brushes for the fan motor and will have them next week. The DC controller I ordered from China so it will be a few weeks before that one shows up.