Rub the pork tenderloin evenly with the dried sage, sea salt, and pepper.
Heat olive oil in a large skillet over medium-high heat. Once hot, add the pork tenderloin and cook until brown on all sides, turning occasionally, about 5-6 minutes.
Reduce the heat to medium-low, insert a meat thermometer in the thickest part of the pork, then cover and cook until the thermometer registers 150-155 degrees, turning occasionally, about 7-10 minutes longer.
Transfer pork to a platter; cover with a foil tent to keep warm.
Whisk 5 tablespoons of maple syrup, 3 tablespoons of apple cider vinegar, and Dijon mustard in a small bowl to blend. Set aside.
Add the remaining 2 tablespoons of vinegar to the same skillet and bring it to a boil, scraping up any browned bits from the bottom of the pan.
Reduce the heat to medium, then add the maple syrup mixture and cook until the sauce thickens a bit, about 2-3 minutes.
Return pork and any accumulated juices to the skillet and coat the meat with the glaze.
Transfer pork to a cutting board, and let the meat rest for 5 minutes before slicing into ½-inch-thick slices. Season glaze to taste with salt and pepper if desired.