@efleming - the only question would be if the wire is stiff enough to insert into the Rachio (the older generations one pushed the wire in.
I believe normal sprinkler wire is 18 gauge. Over this short of a distance the issue isn’t the current carrying capacity, but insertion strength See this post →
If the 24 gauge wire is already buried, then I might create a short pigtail of the 18 gauge wire to connect to the Rachio and then transition with a water tight wire nut or terminal strip to the 24 gauge wire. See →
