I went to upgrade my gauges, but with the racepak it was actually cheaper to buy a dash than new guages.
The sensors cost about what a good gauge will cost, and if you want it to be displayed by a guage, you're going to want to log that measurement going down the track.
The dash can also display warnings and flash warning lights like low oil pressure. It can also flash as a shift light, but I use one in connected to the MSD as its easier to change since I'm in the box in between rounds and almost never in the dash changing settings.