tapping lines

I had a post the other day that talked about adding dual cooling lines; in it i mentioned you needed to tap a line in the pump. What i meant by this is you have to drill a hole in the side of it and then use a metal tapping kit to put threads on that hole you just drilled. when you do this you must know what drill bit size threads you want. Below is a chart with conversion sizes for what drill bit you need for the size threads you want. BE aware you must use grease when tapping and always do a full turn and a half. Then after that full turn and a half you want to go counter clockwise to let the loose metal flakes to work there way out of the threads.