I am now trying to connect the box to the EFIS in the plane.

Questions:

Pin 2 EFIS RX. Can this be pin be shared with another device that get EFIS RX?

What does EFIS /Display TX do ? I don't have a display is this a needed connection ?

OAT analog ? There OAT data on the Advance Flight EFIS data . Can this be used instead ?

I see that GPS is not required is some advantage to using it.

Thanks

Max