Errr...
The OP said "tenderloin": not loin.
A pork tenderloin weighs in at about 3/4lb - 1lb and will be absolutely ruined after about 30 min of cooking, unless it is stuffed.
Cook to 145 IT slice and enjoy (unless you stuff with sausage, then cook to 165)
Here is my go to recipe for a stuffed tenderloin.
http://sirporkalot.com/2011/12/pork-...heese-sausage/