It's not a GM/something else, it's a Year 2000 approx / Year 2013 thing.
In the late 1990's - early 2000's, flashers and hazards had electromechanical or even purely electronic flashers that were stand alone, and they did fancy switching in the turn signal switch to select hazard / non-hazard operation. Or they did the fancy wiring in the hazard switch. Or a combination.
As a first responder vehicle, I'd just say "Screw it!", grab a spare cubby or console bin out of the yard, and drill away.
And if it's not a first responder - why are you putting blue strobes on it?
RwP
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