How to: Powertap P1 Pedals drive my computrainer in TrainerRoad



I’ve been using a Computrainer with TrainerRoad indoors for years. I’ve been using Powertap P1 pedals outdoors for about a year. I noticed that even with both calibrated, my P1 pedals give a higher number reading, especially at higher wattages. To make everything consistent I would like to drive TrainerRoad and my Computrainer with my P1 pedals. I want ERG mode to still work with the Computrainer, but my P1 power readings to override the computrainer’s power numbers.
What do I need to do to make this happen? I assume I’ll need a Bluetooth/Ant+ USB dongle for the computer to pickup the power numbers from the pedals, then change some settings in TrainerRoad?

Thanks for any info!