No circuit board for Wyze Thermostat

[crockett]

Wiring in thermostat without circuit board

Looking for help wiring in my new thermostat to an old hvac unit with no circuit board. I’ve got 4 wires at my current thermostat: red, green, white, and blue. I found these same wires feeding to the unit, as pictured. How do I connect the adapter? [image]