[ciscoriordan]

An electrical issue could cause a gauge to misreport. E.g. vibrations cause a bad ground.

[Sniffnoy]

An electrical issue wouldn't be caused by crossing the international date line.

[dtgriscom]

Maybe the Bermuda Triangle is on walkabout?

[WalterBright]

Crossing the equator causes the sun to flip around and go the other way in the sky.

Source: When I went to Australia, the sun went the wrong way. It was curiously unsettling.