On the Varistream controller underneath it will say two wires go to the pump and two wires go to the battery supply,the hose from the tank goes to the pump and the hose coming from the pump will go to the hose reel 
Really is that straighforward.
But to put it in separate lines:
Pipe from tank to pump.
Pipe from pump to hose reel.
Then for the electrical side your controller has 4 wires as stated, positive and negative to your power source/battery, and 2 that connect to the pump.
Add brush to hose reel, apply to windows, and get to work!

Simples

No pix or diagrams to show, sorry!