This is how to connect a hardwired sensor to a Wireless Crystal Contact using the wireless sensor as a transmitter for the hardwired one.
You are going to wire the hardwired sensor to the terminals in the wireless sensor. Connect a 4.7 K ohm resistor in series with the hardwired contact (see picture).
Take the jumper out of the wireless contact (see picture) this will set it to use the hardwired input instead of the built in switch.
Enroll the wireless contact into the alarm system (same as normal, see enrolling a sensor).