@Blackwolfz - The pictures show an indexing system with an Intermatic type timer which controls the master valve to switch between zones. One will need an outdoor enclosure to put the Rachio Gen 2 in. The one connection would be using the master valve and common terminals. This setup would mimic the existing setup and would not use any of the Rachio intelligence to differentiate between the water needs of different zones.
The best solution would be to replace the indexing valve with individual valves per zone so that the full extent of Rachio’s capability could be used. There are a couple of other posts that show the before and after pictures of replacing an indexing valve system with individual zones - it is not that complicated and should still be well within a very techie person’s installation capabilities (cutting and gluing schedule 40 PVC pipe and some additional low voltage (24 VAC) wiring).
See this knowledge base article for Rachio and indexing valve systems →
Here is one of the posts (starting at 43) where the poster replaced an indexing system with individual zones (with pictures):
and starting at 4 on this one: