My Edge Juice with Attitude allows you to set various sensors within the pillar mount monitor that comes with the product. It intercepts the factory signals like oil pressure, voltage, engine temp, transmission temp, etc. The only one you have to input yourself (and it comes with the product) is the EGT sensor.
I have my monitor set to intercept the transmission temperature, EGTs, and boost. My truck did not come with a factory transmission temperature gauge, but you can get it as a factory option. The signal is still sent to the dash even though my truck didn't have a factory gauge.