i70 System Pack

[tomsp]

Looking for suggestions on wind, speed, depth - just boat a sailboat with
1999 Autohelm boat speed, wind, depth
New e7 chartplotter
New evo200 autopilot
New p70 control head

E7, evo200 and p70 all connected with seatalkng- nice
I also extended the network by adding ray70 for AIS and autopilot remote

Looking to replace all 3 Autohelm wind, speed, depth

The i70 system pack has wind transducer with cable, i70 display, and depth/speed combo transducer, and tc5 converter box to translate the analogue transducers into the seatalkng system

1. How reliable is a duel purpose transducer -boat speed/depth?
2. Will the i70 communicate with my e7
3. Do I need another display or will the i70 plus the e7 suffice?

Thanks - trying to reduce number of displays if possible