I have the new GT-7 in my FT TC3 right now, and love it! Before I had the novak C2, but since it was bigger I had to mount the big cap on the receiver
Not the best thing to do! Now with the GT-7 I have it mounted right infront of the motor with the big cap mount right hand side on the chassis with sticky tape. The included mount takes up a few MM so I had to use the tape. My receiver is a XXTRA, which is bigger than the XXL, and there's plent of room for all the wiring.
All I can say about the speedo is very ssssmmmmmmooooooottttthhhhh! I thought I would miss my pit wizzard, but now I'm ready to chuck it out, and get more GT-7's!