[sam's 72]

I know this has been touched on a lot on here. I finally got some time to do some work on my truck! I am installing the new alternator with internal regulator, I understand how to wire it in. My question is what are you guys doing with your old wireing that is comming off the old alternator, I have three wire that plug to the back of it, a blue, red and white wire, I would like to clean all this up, get the old external regulator out, with the old wireing horness. also which one of these wire are going to the dash for the amp meter? Would like to know before I start cutting wire out.
Thanks
Sam