Sweet winter setup! Those 19s should handle the snow nicely. For tire pressure, I'd start with Ford's recommended pressure for the stock 19s (usually found on a sticker inside the driver's door), and then maybe add a couple of PSI for extra winter grip. As for the TPMS, unfortunately, with the Mach-E, you'll likely need to head to the dealer or a tire shop with the right scan tool to get those sensors programmed. DIY TPMS programming is pretty rare on modern cars, especially with the more advanced systems like the Mach-E's. It's a bit of a bummer, but it's the safest way to ensure your TPMS is working correctly and giving you accurate readings.