I have read the majority of the old threads on this subject but I am still confused. I have a stock wiring harness, factory tachometer, factory console gauges. I am converting to a GM HEI ignition system and a Delco CS 130 alternator. After reading several post, I think I know what to do with the alternator but, I am still confused if I can use my factory tach and ammeter. Is this possible, if so how?