Can't answer your connector question, (don't have the manual in front of me) but soldering is a good way to go. Remember heat kills semiconductors, always use a heat sink and low wattage iron. Solder that is 62% Tin, 36% Lead and 2% Silver has the lowest melting temperature, followed by 63% Tin and 37% Lead. Always use heat shrink tubing to cover the solder connection. In addition to insulating it also provides stress relief and prevent the copper/solder connection from work hardening and failing. This is important in areas where wiring is subject to vibration.