RV converter upgrade

Being that I am not a full-timer, I plan on connecting to shore power when the Xplorer is between trips. The converter that came with this 15 year old camper van was analog and didn't provide for three-stage charging. The deep cycle battery was not properly conditioned as a result. I sought out a fix and here it is.

For this converter: https://www.amazon.com/gp/product/B004A2YS48/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=xpl0d-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B004A2YS48&linkId=75008b7fc39937cef2a16f3506a84001