Year One Engine Forward Harness

You can rent them for $25 each, 50 a pair, 30 days use.
Crimping Tools - for purchase or rent | American Autowire

and or buy any number of cheaper ones.
The astro pneumatic with interchangable jaws is what I first bought.
It's pretty good, makes both crimps at once, but is too wide for male terminals. Some folks have ground a pair of jaws down slightly (on the sides) so they can use them with those terminals.