Correct. You’re fine. It’s really a cool piece. It plugs into the OBD port and when you turn your flashers on it makes all the factory lights flash in different patterns. I haven’t found anything like it for tacomas.
Neither have i.
I thought you just needed a regular relay.
I put heavy duty ones in my pickups shortly after buying them, because I tow a lot, and some seem to struggle with the signal lights when a trailer is plugged in.
This was 20 years ago, but it is a habit now, so i just do it anyway.