if the gp is anything like a regal. you dont have tire pressure sensors in the wheels. i know i dont heave em, and my low tire light comes on when a tire is low regardless what set of wheels i have on the car.

i had the stock regal wheel, tires off nothing inside, got caddy sts wheels nothing inside them either, and my winter wheels have nothing inside. yet tps still works on my car. not sure how it works but it does.