Appreciate your response. I think the North Pole Engineering device is probably the way to go. It’s a decent priced unit and much cheaper than replacing all the Garmin sensors with Wahoo sensors.
What has surprised me is the lack of knowledge by bicycle shop staff. Some say you don’t need anything other than the Wahoo & Zwift, some say you need to buy Wahoo Sensors and some say you don’t need anything.
After I’ve completed setup I’ll share my experience.