On your machine, you would need a wash combination selector to replace the WEI in order to work with a Unitec Wash Select II coinbox. The wiring is pretty straight forward. Just wire the outputs from the wash combination selector in the same positions as the WEI are wired today. In other words, output 1 should go to the same PLC input for each. The inputs to the wash combination selector will come from your coinbox. In 1 is your output relay 1 from the coinbox. There are two setup questions you will also need to change in the machine program to change from one to the other. Setup question 1 "WEI Option?" needs to be changed to "NO", and setup question 3 "Other Arming?" needs to be changed to "YES", but you will need a RYKO hand-held programming console to be able to make that change.