The way my wheel is set up, I used a piece of wire with a fork connector on one end and a spade connector on the other. The fork connector is plugged into the horn plug on the car, then the spade is connected to the horn button on the wheel. This should get your horn button working. As for the indicators, there should be a small black ring behind your boss kit, with 3 (I think) small 'nubs' on it. This is what cancels your indicators, the ring has little cut-outs on the side and as you turn the wheel far enough it makes the stalks flick back to centre. I'm not sure what the back of your boss looks like, but I drilled 3 small indents in the back of my wheel for these nubs to locate into and now my indicators work like normal. You hopefully should be able to do something similar with the steering boss! As for the gap, I'm not 100% but I don't think you can do much about it.