BOSTON — To Rangers head coach Mike Sullivan, the Thanksgiving benchmark is not all it’s cracked up to be.

For the Blueshirts, who spent the holiday in last place in the Metropolitan Division and 21st in the NHL, it can’t be.

History suggests the veteran bench boss is not wrong to resist putting too much stock into the Blueshirts’ first 25 games under his command. Cracking the postseason tournament in April after sitting on the outside looking in at the playoff picture in November has been done before, many times.

The Rangers can’t lose sight of that as they tackle the 57 remaining regular-season games.