What do you need them for? As quoted below which I think was stolen from me lol VATOZONE but I would say anywhere has connectors... However other than to the actual switch I would solder all connections...
As long as it is soldered it should be fine
I was following this tutorial
http://www.gassavers.org/showthread.php?t=5436
showing the line from the fuel pump and have the spade connectors I guess it makes it easier for just plug and play