If you're having trouble establishing a mind-muscle connection with your triceps then begin the workout with something that puts the muscle into a shortened position, and work isometrics (holding the contraction) to help with that. Try a pushdown variation. My favorite for this is the reverse-grip pushdown.
Make a concerted effort to roll your knuckles back towards your body and hold that for a 2-3 count for 3-4 sets.
Dave doesn't waste words. In fact, when he met his wife, he just pointed to what he wanted. Same thing with his articles. No build up. No smooth talking. He just gets right to the point.