I did one once but I can't remember the temps/times etc. Got it to a normal Medium-Rare or Medium temp inside. I didn't wrap or let rest and it turned out really good...I think if I do another one, I'll foil it 2/3 of the way to temp and then let it rest just to see how it does.
I used a temperature probe to poke holes in the tenderloin about an inch or two deep and put whole peppercorns in, then I used some steak or hamburger rub. I've been using a Weber "gormet burger' rub on my steaks and they have all turned out fantastic.
Can't wait to see what you do and how it turns out.