One member PM'd me and said the ground lug on my diagram wasn't clear as to intent, and I agree so I'll clarify. The ground lug is referring to the lug inside the timer box, exactly where you have it now. If you would like me to redo the drawing I can, but I didn't save it (just a quick sketch on some online tool I found).
For a step by step, assuming everything was disconnected and you were starting from scratch:
1. Unplug/disconnect the power, turn off the breaker, etc.
2. Take the black wire from the power coming in, and a black jumper wire. Put these two wires into terminal 5 on the timer.
3. Take the other end of the black jumper wire and put it into terminal 1 on the timer.
4. Take the black wire from the pump and the black wire from the SWG and put these two into terminal 4 on the timer.
-- This completes the black wires --
5. Make a white jumper wire and put it into terminal 2 on the timer.
6. Connect ALL white wires (4) into a wire nut (power in, pump, SWG, and jumper)
-- This completes the white wires --
7. Make a green jumper wire and put it into the ground lug on the timer.
8. Connect ALL green wires (4) into a wire nut (power in, pump, SWG, and jumper)
-- This completes the green wires --
9. Turn the power on and set the timer as desired.
You should only use two wire nuts, one for white and one for green.