If TACy used his 1-shot, he would get the number of guilty voters. So I assume he got 3 since he was going at the Juliet, Destroyer or Midnight.
But then again, we need to know which lynch wagon he investigated since the ability is phrased as if he can use it on any lynch wagon in the game. Which I assume is its purpose since it's an ability that gets unlocked.
Among the voters Juliet, Marimo and Jinbei already qualify for 3 guilty and are confirmed now. So I don't know how else we can analyze the mango wagon.