"I noticed that the cable doesn't connect right if you put the last piece in between in Integrated Tunnels interface and the cable. It works if you put a piece of cable on the interface first, then connect it.

It's not a big problem but I thought I should report it.

Versions:
Minecraft 1.10.2
Forge 12.18.3.2185
Integrated Dynamics 0.6.5
Integrated Tunnels 1.0.2
"

Source: CyclopsMC/IntegratedTunnels#8