Those are all ABS wheel speed sensors. Apparently those are referred to as a VSS as well. Not what I would call the part, but oh well.
Search "Toyota 83181-24070" on eBay to find what you're really after.
The OEM unit does not come loaded with a gear- some aftermarket options do.
Mine is a 28t, and my speedo is dead on with my 315/70R17 KO2. 28 tooth is just what happened to be on the VSS when I got it, but I think that's the smallest gear available- which will make your speedo as "fast" as possible.
Here are part numbers for the various gears-
This is what yours looks like now-
My personal 28t VSS-
And installed-
Feel free to hit me up if I can help any more [emoji1360]