I ordered the display on Amazon: https://www.amazon.de/dp/B0CKQZVYP8?psc=1&ref=ppx_yo2ov_dt_b_product_details
You can also have the installation space temperature displayed. I used this sensor for that: https://www.amazon.de/dp/B07Y1TT243?psc=1&ref=ppx_yo2ov_dt_b_product_details