Well, it's cracked. How bad is it?

Hard to tell where the crack stops, but if it's just that small amount, a dremel with a cut off wheel to remove that small Chuck, smooth it out and call it a day, or use some epoxy to fill the crack. Then When you re install the dipstick put a little bit of "the right stuff" sealer on it and stick it in the hole
Not sure what you mean by Chuck. The beveled part of the dipstick tube on the topside? Would you use JB weld to try to fill the crack and then try to smooth the hole enough to install a new dipstick tube?

Thanks all for the replies. I appreciate them and you helping to lower my stress level a bit.