Enjoy! HAAAAAAAAAAAA!
We had a similar dilemma as we had Ben before the dogs came along, but he wasn't a kitten!
Is Diesel a chaser by nature? If so, careful introduction with him on a lead would be advisable, don't yank him back if he tries to lunge in, just be gentle and praise and reward when he goes to say hello, also teach him to be gentle/steady/careful when kitten is around.
If he isn't a chaser by nature, he may well become why after meeting the speed of a cat HAAAAAAAAA

Sorry, I'm sure you'll be just fine, they have a funny way of sorting themselves out, the kitten will likely be a huge facination for Diesel at first, but the more they see each other the less interesting the kitten MAY become!
Let us know how you get on.
Jo
xxx