swaping to MSD 6al

HA theres always something eh Scott lol , thanks Pishta I am hoping I will be in the 97% not the 3% , I know a lot of people running this box who have had them in multiple cars with no issues and I know 1 guy who is in the 3 % who has gone through several boxes mainly already in cars he bought and just can't catch a break with them . Fingers crossed ,as I said I should be good on the polarity since I'm using an MSD distributor with their connector still on it , the only questionable part about wiring it is the Tach , one set of instructions I have read said to buy their tach harness but the set that came with the box says to use the grey wire for the tach signal , I'm using an aftermarket tach from charger specialties that is digital on the inside but looks like the oe in dash rally tach so I'll have to check with the hotline I think .