The news that the Giants were making a quarterback change — tapping Jaxson Dart over Russell Wilson — came in an X post from a pair of NFL insiders at 12:27 p.m. Tuesday.

Bettors immediately took notice, placing loads of action on the Los Angeles Chargers to befuddle the rookie in Sunday’s clash with the Giants at MetLife Stadium.

And inside his Jersey City office, Seamus Magee’s computer went bonkers.

A manager in BetMGM’s traders department, Magee is tasked with managing BetMGM’s odds and market pricing by monitoring real-time betting activity.

Because odds makers want to encourage equal betting on both sides of a wager, Magee needed to decide whether the 6-point spread was weighted too heavily for action on the favored Chargers. He looked at the rapidly mounting bets and reali

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