BY passing charging gauge 70 challenger

Is it wise to by pass the charging gauge and if so
can some maybe explain:
I understand the hot wire goes from the relay on drivers fender to the gauge if by passed can you run a wire from the relay straight to the Alternator?
Instead of going threw the firewall into the car? or does the headlight switch meet the relay under the dash?
Can i run the headlight switch straight to the relay? if so what do i do with the black wire?
thanks in advance