Had to do some soldering. The power and control plug for the ELT needed to be assembled. I found it odd that they would say to solder rather than use a jack that could be crimped and connected with D-Sub pins. It had been awhile since I had done any soldering and I needed lots of practice before I started on the actual parts. I think it turned out pretty well. I ordered some Loctite 59530 RTV Silicone sealant as recommended in the ACK installation manual.