What's the best way to fix aluminum intake threaded hole for temp gauge sending unit?

GL






I am a gluton for punishment. I couldve been done with this if I just crumbled and brought it to a machine shop. Then again i was turned away a few years ago from the place thats local to me cause I brought in my lower control arms to have the bushings removed and replaced with the new ones I had the the guy turned me away instead of taking my work. I would rather not pay the prick anything if possible. I did buy a kit for 1/8-27 NPT thread repair and it was not cheap at all. Comes with drill, tap, countersink and sleeve installation tool. A little over $100