Hi all, I'm progressing on my dash pad and board replacement on my 76 TR6. Got the winshield replaced and mounted last weekend. My question is: My heater was not piped to the dash, it seems to be factory capped. The demister vents are hooked up. I plan on running new tubing for heater ducts and hooking them up. I have a working switch to install. Do I need to replace the rubber flap that is sealing the scuttle vent and replace it with a screen, or what? Not sure of what is mechanically correct here. Everything seems to indicate that this heater was not hooked up at the factory. Do I need to be aware of anything else before I start to cover up this phase of the project? Thank You All!