I have had my five speed '07 Yaris liftback for about four months now, and the more I drive it the more I wish i had a tachometer. Why doesn't even have a shift light!?

I see that the Yaris sedan has a tachometer listed as an option (not available on the liftback). I do not understand this, but does anyone know if it is possible to get the instrument cluster with the tachometer and install it on my car? Or should I just get an aftermarket tach and mount it on the dash over the stearing wheel? Any help would be greatly appreciated!