I have a question on the charging system wires running to the factory amp gauge, there is one red wire coming from the altenator and one red wire coming up from down by the starter it appears both these connect into one red wire which goes onto a post which i belive is the regulator, it is on the firewall on the drivers side, if anyone could help me to make sure these wires are ran correctly it would be much appreciated, thanks ,
car is a 1972

Here's a basic drawing, as I do not have a diagram for a 70. Regardless, the ammeter needs to be wires in a series with the battery output wire of the alternator.http://elcaminocentral.com/images/articles/ammeter.jpg