I removed and sold my aftermarkey 20" rims. tested out the TPMS so i drove 3mi from the wheels that had the sensors in it. And the little light never came on, so i said deal and just sold the tires and left the sensors. Then 8 days later the TPMS is flashing! WTF is that. why did it take so long? So my tire could have beem flat for over a week before the truck noticed?