How do I show trim tabs on my 7212?

[Doc O Rock]

I have a Garmin 7212, and I had new ACTUATORS with sensors installed this past winter when the bottom was done, so I could read the trim tab position. The installer just this last week finally installed the last piece the Garmin GBT 10 which is the interface between the actuators and the NEMA 2000 back bone. When I powered up the 7212 it asked to calibrate the trim tabs, and I did that. Easy, full up and full down and then it said done. Now does anyone know WHERE the trim position display will be displayed? I also have a Garmin GMI 10 that displays speed depth etc. I wonder if I can get it on there, but when I go into setup no go.