2002 Tach and charging relationship
 

I am working on a 2002 Sonata 2.4 that stopped charging a few days ago.
The tachometer also stopped working.
Fixed the alternator and tach worked fine
Where does the tach get it's signal from, the alternator?
If so which pin sends the signal?
The alternator has pins S-G-FR and L
Hope someone can help, thanks-Wally