Solder the 3 wires from the DHT module to the PPM, GND and +5V on the main board as noted earlier. The order is PPM (yellow), GND (black) and +5V (red) – they are the first 3 pins from top to bottom. Tip: This is the order of pins that I have on my 9x. It’s always wise to search around to see if others have the same connections (as board revisions may change this at some point)