Eichel, who was acquired in a trade from the Buffalo Sabres on Nov. 4 and had artificial disk replacement surgery on his neck Nov. 12, was playing in his second game for Vegas. He had the primary assist on Max Pacioretty's second goal to put Vegas in front 3-2 at 6:33 of the second period.
"He's been out for so long, almost a year, so it's kind of a line of guys trying to find their game after some absence," Pacioretty said. "Did a better job of it tonight, had some opportunities, but still have a ways to go."
Adrian Kempe scored two goals for the Kings (25-17-7), including the winner at 2:18 of overtime after receiving a pass from Sean Durzi on an odd-man rush. Jonathan Quick made 21 saves.
"Going back a couple years, we've always had tight games against Vegas, but I felt like the past couple years they've always been the team to get that extra point at the end," Kempe said. "Vegas is a team that we're gonna have to beat, on the road sometimes, to get the huge points. Now we got the two points tonight, and that was big for us, and we've got to keep playing this way for the rest of the season if we're gonna have a shot at the playoffs."