Yeah, the specialness of the special connector, IIRC, is just a slot cut in the plastic insulator to allow it to slide on sideways. You could probably make your own with a Dremel
Sometimes, a regular female spade connector, without plastic insulator, will slide on.
There is also a special connector for those (you might have something similar on your oil pressure sender) and ToyotaMatt has those. So might Coolerman, so might your dealer.