Electric cooling fan?

One of my past cars I had the guage, the idiot light AND and buzzer for temp, alt, and oil.
If any of the above quit working the light came on as did the buzzer and it showed on the guage.
I had switches for turning off the buzzers if I wanted, because when you first turned on the key the oil pressure and alternator buzzers would both be on as well as the lights for each.
All you do is wire the buzzer into the idiot light circuit, and a switch inline with it in case you want to turn it off.

This way a person could even be standing outside the car and know if the oil pressure dropped, or it got hot, or it quit charging.
I usually turned the buzzers off until the car was running and then turn them on, so I didn't have to hear them screaming when starting the car.