What do YOU want in a new wiring harness?

I have noticed that many new lamp sockets, molded plugs such as voltage regulator and stock electronic ign come with 6 to 10" leads already installed. What would be recomended or not to install theese to new wire.
There is also a ? I have of how to hook up to temp sending units and fuel sending units. What works for you?
(be nice) :)

The pigtails are easily soldered and double wall hear shrunk.

Temp and fuel would be best with the stick style push on connector. Well atleast for the gas because your limited there. The temp if you supply a new temp sender it can open up better connector options.