1. Go to the 1-10v interface settings and set L1 and L2 to "Stream pump" and voltage to 3-8V.
2. Go to the Stream settings located in the Extras section and assign the pumps to a group. If you want to have both pumps on the same group, select a pump group and assign the pumps to that group.
3. Program the pumps in the same screen and click save.
Just remember that Tunze 1 will function for "Odd" numbered L channels and T2 for "Even" numbered L channels.