Be sure to do a switch check after you disconnect from your dish pro LNB and before you do your legacy hook-up. Everything should be empty on your check switch test before you check your line of sight.
It's not going to be permanent - just to aim the dish, then i'll rinse and repeat with 110 and 119, and move the LNBs from their current dishes. Thank ya!!!
I know two feeds from a Legacy LNB works fine, I did it.
I once tried to get a 942 to run off of one legacy feed and it protested mightily. But if I remember correctly, I could read the signal strengths. Could be wrong.