I make the dash easily removable. I use several connectors for all the gages and other items attached to the dash. Packard and Molex are my favorite. You can get these from Waytek
http://order.waytekwire.com/CGI-BIN/...7D3012+M37+ENG

You also can get terminals wires and all the accessories you will need. They ship fast too.

Otherwise it looks like you are on the right track. I usually coil up the unused wires and tuck them in somewhere for future use.

I crimp and heat shrink. I do have a couple of pro crimpers however.