Butch, that is good to know thanks. I also have a GRT Sport EX and a GRT EIS 4000. I do not have my EIS wired to the Sport EX and found out from GRT that on the EIS you have to choose one or the other. You can't mix the units on the EIS. I also wanted CHT and EGT in F and OAT in C displayed on my EIS.
Since I added a Garmin GPS 175 to my panel, I had to move my EIS and now it is not quite as visible so will be wiring that up to the Sport EX and it is nice to know that I can see both there.
Thanks
Keith