Here's how I did tri tip over the weekend. I've done both trex and reverse sear and I prefer the reverse. I like adding a simple board sauce and then cutting the tri tip over the sauce. Lately I've used EVOO, thyme, cilantro, jalapeño, garlic, lime juice, salt and pepper.
I agree Scottborasjr. I was distracted by the kiddo, and missed the timing a little. I was surprised, however, the temp was over 160. Before the thermapen, I would have probably cooked it just a little longer, you know, to make sure I would not be sick Now I've gotta change some of my cooking habits, but for the better.