[KGBnut]

Mine flips back, toward the windshield. It just seemed to make sense so I could stand in front and add water.

I vaguely remember that it won't lock to the radiator in just any position, so I had to figure out where it would lock, having the hinge more or less toward the windshield, and then tighten down the motormeter so it was straight when it was closed.

Ken