Sorry, personally I have no experience with RX-18 - Im using in my tanks Benedini TBS Mini with Elmod ECO only
But I recomend Dan "Battle Armor RC" website (Dan is well known on RCU)
/unfortunately website is in English only/
You can find many information how to connect Benedini TBS Mini and RX-18 , and many other tutorials - see "Tutorials" section on this website
Battle Armor RC
http://battlearmorrc.weebly.com/index.html
For connecting RX18 and Benedini TBS Mini, additional DBC3 module is needed
Wiring diagram (RX18-TBSMini-DBC3)
http://battlearmorrc.weebly.com/inst...-graphics.html
DBC3 infopage
http://battlearmorrc.weebly.com/dbc-info-page.html
Configuration DBC3
http://battlearmorrc.weebly.com/dbc3-set-up-page.html
Benedini info page
http://battlearmorrc.weebly.com/benedini-tbs-page.html