the crimpers that you'll need, are going to cost quite a bit of money. Last I check they were about $30
What you can do, is try some pre-built molex leads, and solder your wires into those leads.
Also, see if you can send it into Bob Long to be repaired, they have the tools and everything to put a new connector on that solenoid. It'll be ALOT cheaper and much less hassle than trying to fix it yourself