Too damn late now ......
The acidic juices from the bug have already eaten a small hole in your car's radiator core which will spew coolant on the cooling fan, shorting it out and shorting out the temperature sensor for the other fan, so both will shut down.
Without the temperature sensor the ECU has no idea of what signal to send to the temperature gauge ..... so, since the default is zero, your gauge won't be working.
Back-in-the-day, when a car overheated, coolant would steam out and you could tell it was overheating and shut off the engine before major damaged happened.
With todays high compression, high revving engines, they overheat so quickly that the rods will seize up before steam escapes the cooling system.
How will you know when this happens? You will hear a series of loud "knocks", sounds like a jackhammer, then a loud BANG, followed by a lot of blue smoke and steam.
When will it happen ...... who knows ......
What can you do about it ...... nothing, you're screwed .....
humfrz