I love instruments within the car to tell me "stuff".
However, as soon as one of these does something - out of the ordinary, I can go into a blind panic!
The missus modern however, does not even have a temp gauge, yet I never worry about the car over-heating....."knowing stuff - is important - but can worry you?"
+1 - My '63 +4 has a ammeter as well as a voltmeter. Not sure what the ammeter does except scare the hell out of Me. As I have an Alternator I pay attention to the Voltmeter and not the ammeter. My Son In Law (auto electric mechanic) says the ammeter is "TROUBLE". Remove it!!!!!!